Arnold Schwarzenegger and Maria Shriver's divorce is set to be finalised in December.
The couple - who tied the knot in 1986 - split three years ago and she filed for divorce in July 2011 following revelations he had fathered a son, who is now 16, with their housekeeper Mildred Baena.
A source told MailOnline: "It's been a long road, for a long time it wasn't a priority for either of them, but the divorce is almost complete. The lawyers are just ironing out the final details.
"If everything goes to plan it should be tied up by Christmas."
Arnold, 67, and Maria, 58 - who have four children together, Katherine, 25, Christina, 23, Patrick, 21 and Christopher, 17 - have come to an "amicable" agreement over their $400 million fortune, although it hasn't been an easy process.
The source added: "It has been a long legal process and not an easy one by any means, but Maria and Arnold are now amicable and have reached an agreement.
"When you have large fortunes to divide and legacies for the children to agree on, things aren't always as clearly defined as you'd imagine.
"But Maria and Arnold have resolved their differences and are on speaking terms, they have four kids together after all.
"They are both in a good place and ready to move on."
Hollywood star Arnold is said to be worth $300 million while NBC News anchor Maria - who is the niece of former US President John F. Kennedy - is estimated to be worth $100 million.
In Californian law, she is entitled to half of his earnings throughout their marriage.
In May 2011, Arnold admitted sleeping with their housekeeper and fathering her son, saying at the time: "There are no excuses, and I take full responsibility for the hurt I have caused."
Maria has since moved on with boyfriend Matthew Dowd, who she was spotted out in public with for the first time at Robert F. Kennedy Jr. and Cheryl Hines' wedding last month.
This comes after it was reported last week that former Governor of California Arnold had an artist paint over the image of Maria's face on his official political portrait.

Avril Lavigne and Chad Kroeger reportedly have major trust issues.
The couple, whose 14-month marriage is allegedly on the rocks, are said to have been "fighting a lot" in recent months because they are both very jealous.
A source close to the pair told E! News: "They're having a lot of issues. There's jealousy on both sides. She flirts, he flirts. She's very insecure to begin with."
The insider also revealed that the 29-year-old beauty is desperate to start a family with the Nickelback frontman, 39, but added: "I don't know what's going to happen. She really wants to have a baby. She was hoping, after this album, to take time off and start a family."
It seems cracks first started to show in the couple's relationship shortly after the release of the 'Let Me Go' hitmaker's latest self-titled album in November, which Chad produced.
The source said: "The main issue is this: When they met, they were in work mode. They were doing a collaboration and that's where the attraction stemmed from. She was in the studio and he was producing her. She was also coming off some bad relationships where she didn't really feel appreciated as an artist. She felt she and Chad connected on that level.
"The album didn't do as well as they had hoped...they're finding that they're not seeing eye to eye on a lot of things."
But Chad and Avril are still hoping to work things out and will only file for divorce as a last resort.
The source said: "I think for now they're going to try to work it out."

Kristen Wiig is rumoured to be dating Scott Speedman.
The 'Bridesmaids' star, who split from The Strokes rocker Fabrizio Moretti last year after 18-months together, and the former 'Felicity' actor have reportedly been "hooking up lately."
The 41-year-old actress was spotted holding hands with the 39-year-old actor at an after-party for the comedy 'St Vincent' at the Toronto International Film Festival earlier this month.
A source told InTouch Weekly magazine: "They spent the entire night laughing and talking.
"She's totally into Scott!"
The duo also left the event together, but another source told E! News they are just friends.
The insider insisted: "[They] have been friends for a long time."
'October Gale' hunk Scott previously dated his 'The Last Resort' co-star Camille De Pazzis, but split from her earlier this year.
He was also linked to his former co-star Keri Russell in the past.
'Saturday Night Live' star Kristen, who was previously married to actor Hayes Hargrove between 2005 and 2009, sparked rumours she had reunited with Fabrizio last November when they were spotted cosying up to one another at a New York Knicks basketball game, after splitting in July 2013.
She previously gushed about the musician in 2012, saying he had brightened up her life.
She said at the time: "I will say that I'm happier than I've ever been, and I feel very lucky."
Pressed about the source of happiness, Kristen added: 'Where I am now. Who he is. Those are the two big ones."

Whitney Port says she never dreamed of having a "fairytale wedding."
The former 'The Hills' star, who is engaged to Tim Rosenman, insists she isn't stressed out about their upcoming nuptials and only recently started planning the special event.
The 29-year-old beauty told E! News: "I really wasn't always one of those girls that pictured what my wedding would be like or pictured having this fairy-tale wedding. So I think that's why I'm so easy-going about it--I know it's going to be a reflection of us and I know just like a special weekend to share with all of our loved ones."
She added: "I'm definitely not nervous. I'm really excited. I'm at the beginning of the planning stages. I've taken my time with it. I don't really feel a lot of pressure, you know, I feel like it's something super-exciting to plan and why put so much pressure on yourself about something like that?"
Whitney, who previously claimed she won't buy her wedding dress until the "last minute," as she is worried she'll change her mind about it before her big day, was forced to skip her former co-star Lauren Conrad's wedding to William Tell at a small winery in Santa Ynez, California last Sunday (14.09.14), but says there is no bad blood between them.
The fashion designer said: "I emailed Lauren this weekend, I wasn't able to go to the wedding unfortunately. I really wanted to go, but I couldn't and I'm so so thrilled and happy for her."

George Clooney plans to toast his upcoming nuptials with his own tequila.
The 53-year-old actor's close friend and rumoured best man Rande Gerber, who is married to supermodel Cindy Crawford, was spotted loading 100 cases of their award-winning Casamigos Tequila onto a private jet from California to Italy, ahead of his wedding to Amal Alamuddin in Venice on September 27.
Sources told PEOPLE.com that the restauranteur, who cofounded the beverage brand with the Oscar winner, brought dozens of bottles of Blanco, Reposado and Anejo tequila to Europe for the couple's big day.
It was recently revealed the 'Monuments Men' star's future parents-in-law, Ramzi and Baria Alamuddin, are footing the bill for the wedding, as they have insisted on sticking to the tradition of the bride's family paying for the event.
An insider said: "Crazy enough, her family is paying for most of it!"
The couple are expected to wed in front of just 60 guests, including Matt Damon.
Earlier this month, George admitted he can't wait to get married.
He said: "I would just like to say to my bride-to-be, Amal, that I love you very much. And I can't wait to be your husband."

Ben Affleck admits he was caught counting cards in Las Vegas in April.
The 'Argo' star, who has three children, Violet, eight, Seraphina, five, and two-year-old Samuel, with wife Jennifer Garner, says he has been punished for "being good" at blackjack, but insists he wasn't kicked out of the Hard Rock Hotel & Casino because he used the gambling strategy, which involves counting card values to decrease betting risk during a major game.
Asked about the incident, the 41-year-old Oscar winner said: "That is a true story. I mean, that took place. I took some time to learn the game and became a decent blackjack player. And once I became decent, the casinos asked me not to play blackjack. I mean, the fact that being good at the game is against the rules at the casinos should tell you something about casinos."
The 'Batman v. Supreme: Dawn of Justice' star added: "I had always liked blackjack. I don't play any other games of chance. I don't bet on football games, and I don't gamble at all, really, outside of that. But I knew with blackjack that there's a way you can improve your odds. And so I started trying to learn. And then I just got to a point in my life where I'm like, 'If I'm going to do something, I'm going to try and do it really well.' "
But Ben says he wasn't escorted out of the casino by security.
He said: "No, I wish! That would be awesome. [Like,] 'Get him outta here! He's a magician!' Unfortunately, they just came up and said, 'We can't let you play blackjack. But we have other table games! We have Chinese poker!' "
The 'Good Will Hunting' star was also allegedly kicked out of the Caesar Windsor Hotel and Casino in Ontario, Canada in May for counting cards.

Iggy Azalea is suing her ex-boyfriend, who claims to have a sex tape featuring the star.
The Australian rapper has filed a lawsuit against Hefe Wine, accusing him of illegally downloading the entire contents of her personal computer while they were living together in Atlanta, Georgia in 2009.
The 'Fancy' hitmaker made no mention of the alleged sex tape in court documents, obtained by gossip website TMZ.com, but says the data included unreleased master recordings and she believes Wine is trying to take advantage of her success.
She is also accusing him of directly using or converting the data to create a new EP, which he announced in July will "shock the world" upon it's release.
The blonde beauty - who is dating NBA star Nick Young - insists that Wine forged her signature on a legal document, giving him exclusive rights to her music and music videos.
She claims the contract was pasted together from a legit document she once signed.
Wine recently claimed Iggy indirectly gave him permission to release and market their alleged sex tape, by signing the contract and giving him the exclusive rights to "manufacture, sell, distribute and advertise 'any' recording embodying visual images."
But the 'Black Widow' hitmaker - real name Amethyst Amelia Kelly - previously insisted on Twitter that the tape doesn't even exist.
Last Thursday (11.09.14), she tweeted: "Obviously I've seen the news feed today and I just want to say I don't have a sex tape."
Iggy added: "We should want to protect our women and I really hope that America will follow Europe and their laws to better protect peoples privacy and fundamental rights [sic].
"And on that note, I'm off to get a manicure peaaaaaaceeeeeee outttttt *drops the mic* (sic)."

Neil Patrick Harris' children pressured him to get married.
The 41-year-old actor, who tied the knot with longtime boyfriend David Burtka in Italy earlier this month, admits their four-year-old twins Harper and Gideon, born via a surrogate mother in 2010, were one of the main reasons they decided to walk down the aisle.
The 'How I Met Your Mother' star said: "I think when our kids got to the age when they were having reasonable conversations where they're asking lots of 'why' questions, then it seemed [important] to be able to have a real clear-cut [identity] of who their daddy is -- that he's my husband, it was easier than partner or boyfriend."
But the star was also eager to commit to David, 39, after more than 10 years together.
Speaking on 'The View' about their recent nuptials, he said: "I just wanted to be able to say nice things about David to David in front of the people that mattered the most to us. It was less about a proclamation and more about a declaration that I was able to share in front of our kids."
He added: "It was nice, very small and intimate. Only about 45 people were there. We did it as a destination wedding, and it kept the numbers down."
The couple got engaged following the passing of the Marriage Equality Act in New York in June 2011.

Sharon Osbourne slit her wrist to prove her love for Ozzy Osbourne when she was 27.
The 61-year-old star has revealed she was hospitalised after cutting herself deeply with a steak knife while she was drunk with her now-husband, and still has a scar.
The 'Talk' co-host opened up about the "stupid" incident for the first time as part of the show's Secrets Week on Wednesday (17.09.14), saying: "I've never discussed it out of embarrassment of how stupid I was at the time to do such a thing to myself."
Explaining how it happened, she said: "I was 27, I was just going out with Ozzy at the time...and when we first got together, we would drink a lot together. We had a session of partying...and it's about four in the morning and he says to me, 'How much do you really love me?'...And I'm saying, 'I'd do anything for you, anything, I absolutely adore you...I'd give my life for you.' "
She added: "I'm like, 'I'll show you how much I love you, I'd die for you'...so I went to a room service table...and there was a steak knife. I get the knife and I'm like, 'I love you so much' and slash, slash, slash on my wrist.' "
After an ambulance was called to the scene, Sharon told paramedics she was simply being "a dramatic drunk," but says they believed she had attempted suicide.
She added: "They put me on lockdown! I permanently scarred my wrist and I was on lockdown for being overly dramatic and drunk ...now, I tell everyone I was attacked by a dog."

Pharrell Williams believes in alien life.
The 'Happy' hitmaker thinks people are "incredibly arrogant" and "pompous" if they don't believe there are extra-terrestrials in the universe.
Speaking to Stylist magazine, he said: "I believe in God but I also believe in the universe ... and I believe in that innate ability to make decisions and to exercise our feelings as human beings.
"How do you see all the stars and think there's nothing else out there?
"It's so incredibly arrogant and pompous. It's amazing that there are people who really believe that. It's unbelievable."
The self-confessed feminist also hit out at misogynists, insisting women have the power to end the world if they chose to.
N.E.R.D star Pharrell added: "If women decided they didn't like what we were doing as a species, they could end the planet.
"So when I hear people say 'empower women', it's not possible to empower women. It's just necessary for women to remember their power. Power is a perception and it's one that you guys [women] were raised to ignore and believe something that's false, like a male-dominated world. That's the biggest joke that man has played on society and we've all bough into it. Is this really a man's world? Is it really? Do men give birth to men?"

George Clooney's parents don't know what to buy him as a wedding gift.
The 'Monuments Men' star - who is worth a rumoured £100 million - will marry human rights lawyer Amal Alamuddin at the end of this month but Nina, 75, and Nick Clooney, 80, are unsure whether the couple would prefer a present of a donation made to a charity of their choosing.
Nina said: "I haven't got them a wedding present yet because we haven't decided what to get, or if they would prefer some kind of donation."
The happy couple are planning to tie the knot in Venice, Italy, and George's mother thinks they have chosen the perfect setting for their big day.
She is quoted by Britain's Grazia magazine as saying: "It is in Venice at the end of this month. We are just thrilled. We have been to Venice before and it is the most romantic place. It will be lovely to see George get married."
The 53-year-old actor recently gushed about his excitement at marrying Amal.
Speaking at an event in Florence, he said: "I met my lovely bride-to-be here in Italy and I will be marrying her in a couple of weeks in Venice, of all places.
"I can't wait to tell Amal, 'I love you more than anything and I can't wait to be your husband.' "

Ariana Grande has been accused of making diva-like demands on the set of a television project.
The 'Bang Bang' singer is fast developing a reputation for being one of the most high maintenance figures in the entertainment industry, and someone who recently saw her at close quarters on the set of a TV project admits that some of her behaviour is so outrageous that it's almost laughable.
Speaking to the New York Post's Page Six column, the source said: "It's like the president is in town.
"Everyone is kind of stressed and at the same time, they're making fun of her because it's much ado about nothing, really."
The source added: "She kind of speaks down to everyone around her."
This comes shortly after it was claimed that Ariana, 21, stopped a photoshoot promoting her new album 'My Everything' because she wasn't happy with the first picture.
The 'Problem' hitmaker ordered the shoot to be stopped, complaining that her earlier requests to photographers and media weren't met, according to Australian news site news.com.au.
It's alleged that the list of requests included "don't use natural light" and "do shoot only from the left side of her face".
The media were also handed a list of questions they should not ask, including any relating to "relationships, dating and ex-boyfriends", and "working or collaborating with Justin Bieber".