Mila Kunis and Ashton Kutcher are planning to get married in a registry office.
The couple, who got engaged earlier this month, are expecting their first child together and are keen to tie the knot in April before their new bundle of joy arrives.
A source told The Sun newspaper: "They are planning to get married in LA in April. They just want it to be made legal so are happy with a registry office.
"Mila, especially, wants it to be very low-key, with just their family there and a BBQ in their garden afterwards. She doesn't want to do anything showy or over the top."
Though they are planning low-key nuptials, Ashton - who was previously wed to Demi Moore - wants to mark their marriage with a big celebration later in the year.
The source added: "Ashton wants a party for all their friends later in the year in the south of France, which Mila is up for, depending on how they cope with having a baby."
The loved-up pair are adamant they will be "hands-on" parents when their baby arrives and are said to have ruled out hiring nannies, despite them both having busy acting careers.
The duo sparked engagement rumours a few weeks ago when Mila, 30, was spotted wearing a diamond sparkler on her ring finger while out shopping in Los Angeles.
Ashton, 36, began dating the brunette beauty in 2012, following his split from Demi, but they have known each other for years after playing the lead roles in hit 1990s sitcom 'That '70s Show'.

Simon Cowell is trying to hire Rihanna for 'The X Factor' judging panel.
The 54-year-old music mogul - who is set to return to the show with Cheryl Cole - is hoping to lure the 'Diamonds' hitmaker to join them because she draws lots of media attention and Simon is desperate to make the show more popular than BBC One rival 'Strictly Come Dancing'.
A source told the Daily Star newspaper: "Simon and Cheryl have two months to find someone to sit in that chair and they want to get the right person.
"This year is an important one for 'The X Factor'. Simon can't be complacent and has to come back with a real A-Team.
"Rihanna would be a shock selection because she is not an obvious choice for a family show - but that's what he wants."
Simon previously revealed he will include Cheryl, 30, in any discussions regarding who will join them on the panel and she will have final say on new appointments.
It's thought the pair are at odds over whether to rehire the show's longest serving judge, Louis Walsh, with Cheryl eager to axe him from the show.
Other names being discussed for 'The X Factor' panel include LMFAO rapper Redfoo - who is a judge on the Australian version of the singing competition - and Black Eyed Peas frontwoman Fergie.

Corey Stoll is in talks to join Marvel's 'Ant-Man'. The 'House of Cards' actor - who played Peter Russo in the first series of the political revenge drama - is negotiating a deal to join the superhero movie in an unspecified role, reports Variety. Hi...

Ferne McCann doesn't think 'The Only Way is Essex' has ruined her relationship with Charlie Sims.
The reality star broke up with her boyfriend last year on the show after he was photographed smooching another woman last summer, but the brunette beauty doesn't believe the programme was to blame for their split.
She told NEW! magazine: "'TOWIE' hasn't ruined mine and Charlie's relationship or our lives. If anything it's benefited it and it's accelerated our break up. We would have broken up 'TOWIE' or no 'TOWIE'."
Ferne also hasn't ruled out getting back with Charlie, who she has dated on/off for three years, because she'll always love him.
She said: "I love him and always will - he's my first love."
However, the 21-year-old hunk may not feel the same after he found out that Ferne had cheated on him back in December with Frank Major.
He said previously: Every excuse she has given is bulls**t. She says in every interview that she wasn't happy and couldn't trust me because of the cheating. She cheated on me and then dumped me the next day, a week before Christmas. That girl has no f***ing heart. I had Christmas presents under the tree for her - I'm pretty sure she didn't have them for me."

Kirk Norcross wanted to release a single so he could listen to it in his car.
The former 'The Only Way is Essex' star is trying his hand at music and has brought out his own track, but he insists he didn't create a song to storm onto the charts.
He explained: "It's always been a dream of mine. I'm not worried about the charts, I just want to listen to it in my car! That's why I'm giving the proceeds to the ADHD Foundation [Kirk was diagnosed with Attention Deficit Hyperactivity Disorder when he was younger].
"I always get knocked for what I do, 'Celebrity Big Brother' and 'TOWIE' and stuff like that, but this is the only thing that's had positive comments. I really want to keep on singing."
The 25-year-old hunk admits he knows his song will go down well with his fans because N Dubz singer Dappy told him it was "amazing" when he played it to him.
Kirk said: "Dappy said it was amazing, which was enough for me because I think he's so talented."
Despite his admiration for the cheeky rapper, Kirk insists he'd never collaborate with him because he believes Dappy would put him to shame.
He told NEW! magazine: "Do you know what, I wouldn't, because he's so good, I just want him to do his thing."
Kirk's single 'Ain't No Sunshine' is out now.

Rita Ora has likened her new single to Whitney Houston.
The 23-year-old singer will launch her second studio album with comeback track 'I Will Never Let You Down' - which was produced by her boyfriend Calvin Harris - and she claims the song is reminiscent of some of the late 'I Will Always Love You' legend's earlier work.
She explained: "'I Will Never Let You Down' is obviously a very important song to me because it's a love song, but it reminds you of Whitney, and that was the vibe we were on. We just wanted to feel good. You know that feeling of 'How Will I Know' with the synth? It just makes you feel happy ... that's what I wanted to create."
Rita also confirmed she has collaborated with 'Thrift Shop' hitmaker Macklemore on her new album.
She gushed to Paper magazine: "We have this amazing song, 'Young Dreamers' with Macklemore and it's so cool. It's for the kids, and it's liberating and so fun."
The 'R.I.P.' hitmaker is determined to crack America with her new album, but admits she is "scared" about taking on the challenge.
She added: "Conquering America for a UK artist is incredible because that's what everybody wants and dreams about. The accomplishment is dominating a market which you aren't familiar with. I am a bit nervous. I am a bit scared, I'll be honest."

Ariana Grande broke three toes after slipping in urine.
The 20-year-old songbird suffered an agonising injury over the weekend when her pet dog Ophelia urinated on the floor and she accidentally walked right into the puddle.
Ariana's manager Scooter Braun - who also oversees Justin Bieber's career - shared the star's embarrassing moment by posting a screenshot of her text message on Instagram.
She wrote in the text: "Had a party last night and in front of a lot of people I slipped on a huge surprise pile of Ophelia piss, slammed into a wall and broke 3 toes. Have a great day."
Scooter captioned the screenshot, writing: "Monday morning texts from @arianagrande are always the best. Lol. Gotta love this girl. Feel better Ari (sic)"
Despite breaking her toes, 'The Way' hitmaker said she had an amazing weekend and even treated herself to a new tattoo.
Ariana wrote on Twitter: "had the best weekend I've had in forever minus my minor foot injury lol...
"a lot of my friends got their 1st tats last night at my house, it was such a bonding experience thank u @romeolacoste for the beautiful art (sic)"
Quizzed if she got a new tattoo, Ariana wrote: "yes I got 'bellissima' small on my side. it's what grandpa's called me my whole life (sic)"

Kelly Brook has celebrated her engagement to "the most wonderful man".
The 34-year-old beauty is set to walk down the aisle with former 'Gladiators' star David McIntosh following a whirlwind romance, which began on New Year's Eve, and she has shared the big news with fans by posting a picture of the pair holding a balloon reading 'Engaged' on Instagram.
Kelly and David - a former Royal Marines commando - are all smiles in the snap as David puts his arm around his stunning bride-to-be.
In the caption, Kelly gushed about meeting her beau's family during a recent trip to his hometown of Wigan.
She wrote: "Lovely Weekend in Wigan meeting my New extended Family Such happy times and excited to share my life with the most wonderful man I've ever met (sic)"
Kelly and David have had an on/off relationship since they met on New Year's Eve three months ago.
The burly hunk is thought to have spent large amounts of time at Kelly's north London home in the early stages of their romance, but the pair reportedly split shortly after Valentine's Day in February - only to get back together.
A source recently said of the engagement: "It's still a closely guarded secret and came to Kelly as a massive shock.
"But she is at that time in her life now where she wants to make a commitment and she has fallen head over heals for David.
"He has also had enough of being a bachelor and can't believe he has landed someone like her."

Amy Poehler watches a new film with her kids every Thanksgiving.
The 42-year-old actress - who has five-year-old son Archibald and three-year-old Abel with actor Will Arnett - celebrated the last festive holiday, which fell November 28, while watching 1971's 'Willy Wonka & the Chocolate Factory' and has already started planning what the children will watch this year.
She said: "Well I started a new thing with my kids that we would watch a movie on thanksgiving that we've never seen before. That's always fun to show your kids movies they've never seen. Last year we watched the original 'Willie Wonka' on Thanksgiving, which is great. And so maybe this year we will watch 'Free Birds'."
The actress voices Jenny, a turkey, in 2013's 'Free Birds' and where she stars alongside Woody Harrelson who plays fellow bird Reggie.
Harrelson - who has daughters 20-year-old Deni, 17-year-old Zoe and seven-year-old Makani with Laura Louie - insists the animated comedy has become a favourite for his youngest child.
He added: "This the first movie I've done that my kids can watch, so uh ... even the 20-year-old. The weird thing was the other day I was with my seven-year-old rascal, Makani and asked her what her favourite movie was, not tryna lead her toward anything but really wanting to know and she goes 'Free Bird!' "
'Free Birds' is released on DVD, Blu-ray and Digital Download in the UK on March 24.

Cream's Jack Bruce "fell out of love" with recording.
The group's former bassist and singer - whose band included guitarist Eric Clapton and drummer Ginger Baker - has now released his first solo album in almost 10 years, 'Silver Rails', after rediscovering his love of working in the studio.
He told BANG Showbiz: "I kind of fell out of love with the recording process and life got in the way.
"Two years ago I worked all over the world. I've got this amazing band called the Big Blues Band, [a] three piece band and we were just playing.
"We went from South America to everywhere, all over the world, and that was fantastic, but also a little bit tiring for me in my age."
The 70-year-old musician played with the 'I Feel Free' supergroup between 1966 and 1968, before they briefly united in 1993 and 2005, after which Jack said Cream were "over".
He went on to have a successful solo career after the band initially split but in 2003 he was forced to focus to deal with devastating health issues after being diagnosed with liver cancer, as a result of former drug abuse.
Jack had to have a transplant and afterwards said he felt as though he'd been given "a miraculous extra lease on life", which he described as a "wonderful gift."
The star said he was asked to record again by a friend in the industry and although he didn't name the pal, he admits he was persuasive enough to get him back into the studio.
Jack said: "He has been really good to me over the years and had my back.
"He suggested, 'Would you fancy doing a studio album?' and I hadn't really thought about it. But then when I thought what a great time to do that because I've had this amazing life in music and I can look back over that and also kind of sideways, if you know what I mean.
"It turned out to be exactly the right thing to do. Everything just fell into place .... it was like magic."
Jack's hypnotic album 'Silver Rails' is out now.

Peter Andre has been drinking coffee to get through "sleepless nights" with his new baby.
The 'Mysterious Girl' hitmaker and fiancée Emily MacDonagh are doing their best to establish a routine for 11-week-old Amelia, and think their persistence is paying off as she is able to sleep for longer, though the singer is still relying on caffeine to get him through the day as he isn't as rested as he would like to be.
Speaking in his weekly column written for New! magazine, he said: "My coffee machine is getting me through the sleepless nights with Amelia. She's actually getting a lot better and some nights she sleeps for up to six hours. I think that's because we haven't been going out a lot and we're focusing on our routine."
Peter - who also has eight-year-old son Junior and six-year-old daughter Princess Tiaamii from his marriage to Katie Price - claims the latest addition to his brood is growing up fast, although he is not sure whether Amelia has taken on his own or her mother's looks.
He explained: "All the kids are changing so rapidly, but I can really notice it with Amelia. Last week I was beginning to think she looked more like me but this week she definitely looks like Ems. Her eyes are bright blue."
Meanwhile, Peter revealed he will be making his own baby food when he weans the little girl.
He added: "We received a Babycook Duo blender from Béaba and we can't wait to use it."

Sheryl Crow likes to "test drive" men.
The 'All I Wanna Do' hitmaker - who has adopted sons Wyatt, six, and Levi, three - admits she struggles to commit to one choice in both her personal and professional life, resulting in learning from her mistakes in an "expensive" way.
Speaking to Graham Norton on his BBC Radio Two show, Sheryl said: " I've done everything wrong once before I realise what it is that I need to do, that's just the way I learn. My first video for 'All I Wanna Do', we made a video for that and then scrapped it. It's an expensive way to learn lessons, but sometimes you just have to feel your way through it.
"I like to marry one guy before I settle down and really marry the second. No, that's not true, I haven't been married but I have been engaged three times, so that should give you an indication of what my pattern is. I like to test drive a lot of different men."
The 52-year-old singer admits she finds it "weird" how quickly time seems to be passing and is always amazed at how she sees her sons growing.
She said: "It's weird, I'm looking at my six year old who has long hairy legs now, yesterday he was a baby. Time is going so fast."
Sheryl and her family live in Nashville, Tennessee, and she loves her simple life on a farm in the "hip" town.
She said: "I live on a farm and this is how I dress all the time, muddy jeans and muddy boots and we have horses and until recently we had chickens, we're getting chickens again, and a couple of cows. We live right square in the middle of Nashville, if that tells you anything about the town. It's crazy.
"I moved there eight years ago after I had breast cancer, put roots down, and it's just weird, you can look and there's a house there and then right next to it, with 50 acres, then another. It's an odd place, it's very sprawling."