George Clooney has asked Matt Damon to be his best man.
The 53-year-old star proposed to his girlfriend Amal Alamuddin last month and although rumours had suggested he was planning to ask Brad Pitt to be his best man, it's now been revealed that he's chosen his 'The Monuments Men' co-star instead.
A source told The Sun newspaper: "A lot of people thought Brad was a certainty to be George's best man as they have been such good friends for years. But he is probably even closer to Matt.
"Besides many years ago, during one drunken night together, George made a promise to Matt that he would make him his best man if he ever got married - so Matt called to claim his prize."
However, as 50-year-old Brad worked with Matt, 43, and George on 'Ocean's Eleven' and it's sequels, it's thought that the hunk will be there to support both of his pals.
The source added: "Brad took the news with good grace - but he did say he'd heckle Matt during his speech."
Meanwhile, George is reportedly planning to throw his British lawyer fiancée the wedding of her dreams either at his home in Lake Como, Italy or Cabo San Lucas in Mexico, before relocating to London so that she can continue her work as a barrister at the Doughty Street Chambers.

Zayn Malik has bought his fiancée's mother a new house.
The One Direction star is engaged to Little Mix singer Perrie Edwards, 20, and reportedly decided to foot the bill for his future mother-in-law Debbie's new home in Dorset, south west England when he heard she was planning the move.
A source revealed: "Debbie has been saying how she's got a new house.
"Perrie was going to get the mortgage for her and then Zayn offered to buy it outright.
"She is just moving stuff in now. It costs more than £200,000 and is a new build."
Zayn has been dating his fellow pop star for two years and popped the question last summer, and her family are said to be thrilled with his latest act of kindness.
The source told The Sun newspaper: "He's a really nice chap for buying the house.
"It's a lovely gesture ahead of their wedding.
"He gets on really well with her family."
The 21-year-old singer, along with his bandmates - 20-year-olds Niall Horan, Liam Payne, and Harry Styles and Louis Tomlinson, 22 - have become the richest boyband in British music history as they reportedly have a combined fortune of £70 million.

Foxes insists she doesn't take herself too seriously.
The 'Holding Onto Heaven' hitmaker, real name Louisa Rose Allen, admits she's actually a bit of a tomboy and isn't impressed by people giving her the tag of 'girl next door'.
She told Clashmusic.com: "Blah blah blah ... I think I'm maybe a bit of a lad, actually. At the moment I'm living with three of my best friends, and they're all guys. I'm not really a girly girl at all. I don't take myself too seriously."
She added: "I hate being called cute ... a girl doesn't want to be cute."
The 25-year-old star, who will take to the stage at Glastonbury Festival this summer, and she says she's "very, very excited" about the event at Worthy Farm, which is being headlined by Kasabian, Arcade Fire and Metallica.
She said: "I love festivals, I'm a festival fan, I'd go anyway."
And she's continuing to prove the critics wrong, both as a pop act and a song-writer.
Foxes added: "I get quite a lot of people thinking I don't write the music, which is mental, but I guess, which you're considered a sort of 'pop' act some people just immediately think, 'Ah, you didn't write it'."
Foxes' debut studio album 'Glorious' is out now.

John Turturro had a threesome in the 70s.
The actor and director - who stars in 'Fading Gigolo' where he has a raunchy scene with Sharon Stone and Sofía Vergara - admits the experience wasn't all it was cracked up to be.
He told The Guardian newspaper: "Once, back in the 70s.
"I was a certain age in the 70s, people were trying all kinds of stuff, it was before Aids. I was younger. It was awkward. People do that, they say, 'Let's have a threesome,' and your brain is going 'yeah yeah', and then they go, 'Dude, this is a fucking disaster... This is not what I thought it was going to be.' People get jealous, this and that."
Although Turturro directs 'Fading Gigolo' he admits he learnt a lot from Woody Allen.
He added: "He sent me these voluminous emails which I would lay down to read. Woody would tell me, 'I hate this ... I hate this ... I hate that ... I like this.' He saw that I could take his withering criticism. He encouraged me to read some Isaac Bashevis Singer. I really got to know him way better than most actors who have worked with him, except the ones who have worked with him 10 years."

Rita Ora gets "suspicious" of Calvin Harris when they're apart.
The 23-year-old singer has been dating the 30-year-old DJ for the past year and when they have to spend long period of time away from one another, she admits she feels insecure.
She explained: "I don't get jealous, I get suspicious. Any girl would, though. It's only because you miss that person, that's really the reason."
The blonde beauty has cut down on her partying since she's been in a relationship and enjoys going out for a romantic meal with Calvin.
She explained: "Instead of going out to party with friends, I go to dinner with my boyfriend. I'm only 23 and he's 30 so there are a lot of things I'm
learning along the way that he's very patient with. It's just great to have someone there who cares about me."
Although their relationship is going strong, the 'I Will Never Let You Down' singer still hasn't thought about marriage or having children.
Asked if she is ready for marriage and babies, she told Britain's HELLO! magazine: "Oh, wow, I guess not. But I'm in a happy place right now. I'm just enjoying myself."

Marion Cotillard would be 'torn apart' by the thought of her son going into acting.
The French actress , who has two-year-old son Marcel with director Guillaume Canet, insists she would support his decision to go into the industry but doesn't like the idea because of the pressure he would be under.
She told French magazine Ciné Télé Obs: "To see him manifest an interest in acting in the future would tear me apart. To be a good actor, you have to have big, big flaws that may never be fixed.
"On the one hand, I would hope he would become a great actor. On the other, I would know his desire would be followed by something very painful."
The 'Inception' actress insisted she doesn't worry about her son growing up surrounded by the showbiz world, but does her best with his upbringing to ensure he never "resents" her.
When asked if she worries about her son growing up in the showbiz world, she also told the French version of Marie Claire magazine: "No, because he's going to grow up in this world, regardless. I do everything I can to make sure he doesn't one day resent me for not doing everything I could possibly have done for him."

Janet Jackson has paid tribute to her late brother Michael after he appeared via hologram at the Billboard Music Awards last night (18.05.14).
The 'All For You' singer was impressed by the way technology made Michael - who died of acute Propofol intoxication in June 2009 - so convincing as he performed to 'Slave to Rhythm' at last night's (18.05.14) Billboard Music Awards.
She wrote on Twitter: "My brother, Michael, was, is and always will be a genius. I love you, Mike. Janet."
It was originally rumoured Janet was set to join the hologram version of her brother on stage for the performance of the song - which Michael originally recorded with L.A. Reid and Babyface during sessions for his 'Dangerous' album in 1991, but which has only just been released on the posthumous 'XSCAPE' record - but she wasn't able.
Another tweet, posted by her team, said: "Janet wishes rumors she'd be at the #BillboardAwards were right. She never confirmed as her schedule would not permit. She sends wishes for a great event."
Michael's brother and former Jackson 5 co-star, Jackie, said he was moved to tears by the emotional holographic performance.
He said: "When he started walking and dancing, I was teary-eyed.
"It's hard to please Michael's fans and Michael... I'm telling you it's amazing."
There had been a huge demand for a hologram performance - which saw the image of Michael joined by 16 dancers - from the star, but John Branca, the executor of the late singer's estate, felt the music awards was the perfect setting.
He said: "It's so important to experience Michael Jackson in a live setting. This is something where we wanted a live performance in front of a live audience and nothing speaks to that more than an awards show."

Snooki has joked her unborn baby is "already applying lipstick".
The reality TV star - real name Nicole Polizzi - shared a sonogram picture of her second child in the womb with her followers today (19.05.14) and joked she is already applying make-up, as her hand is close to her mouth.
She wrote: "My baby girl! She's healthy and look, she's already applying lipstick #mygirl."
The former 'Jersey Shore' star's daughter will be her second with fiance Jionni LaValle, joining their 20-month-old son, Lorenzo.
The 26-year-old star - whose best friend and 'Snooki and JWoww' co-star Jenni Farley is also expecting, with her fiance Roger Mathews - has previously said she is much more active with her pregnancy this time around, which is making her feel much better about herself.
She said: "My first pregnancy I didn't do anything. I just sat and ate on the couch and I was literally a whale - I slept 24 hours [a day]. And I was so negative and hated life cause I just didn't feel good at all.
"With this pregnancy I'm working out and eating healthy and just way active - so I just feel better about life."
'Snooki and JWoww' is set to return for a fourth season later this year, which will document the pair's dual engagements and pregnancies.

Paris Hilton is being sued by a footwear company for $2 million.
A breach-of-contract lawsuit against the socialite and businesswoman has been launched in New York by Antebi Footwear Group, which claims she went back on a business deal with them and even promoted a rival product.
The company's move is in response to a non-payment of royalties suit launched by Paris against the footwear designers, with whom she launched a line in 2007, which asked for $1 million in unpaid royalties.
Antebi's countersuit says it is seeking the return of $2 million already paid as royalties, and claims she breached her contract after inking a deal with rival company Retouch and promoting the resulting Parisian Parc footwear line on social media.
According to the New York Post newspaper, the lawsuit states: "[Paris Hilton Entertainment] breached its covenant of good faith and fair dealing to Antebi by means of its aforesaid intentional and malicious acts and by destroying and injuring Antebi's rights to receive the fruits of its relationship with PHE and those rights granted pursuant to the exclusive licensing agreements."
Paris originally claimed Antebi failed to honour its licensing agreement and unlawfully squeezed out of paying her royalties.
Promoting her line with Retouch in September last year, the former reality TV star tweeted: "Obsessed with all my new shoe designs. Love how all the fabrics & colors go perfectly with my [handbags]."
Paris' original licensing agreement with Antebi runs until the end of this year.The case continues.

Lindsay Lohan has been awarded $150,000 in a legal case.
The 'Mean Girls' actress' clothing label, 6126, was awarded the huge amount to settle their lawsuit with D.N.A.M. Apparel Industries.
Lindsay had claimed the label - which she struck a deal with in 2009 - had failed to pay her for licensing her 6126 trademark overseas, demanding $1.1 million.
The company countersued for $5.5 million, claiming Lindsay's "drug-addled image" and trips to rehab destroyed 6126's reputation and meant they had trouble offloading stock.
According to TMZ.com, the settlement ends both lawsuits. It also means Lindsay doesn't have to testify in court about her miscarriage, which stopped her from filming her recent reality show for Oprah Winfrey's OWN network for two weeks, and which she had also said was one of the reasons she had not responded to D.N.A.M.'s lawsuit.
The 27-year-old star has given very few details about what happened to her, and was visibly upset as she talked about the tragedy for the first time.
Speaking on the final episode of the show, 'Lindsay', she said: "No one knows this, and we can finish after this, I had a miscarriage for the two weeks that I took off."
After a long pause, the flame-haired beauty added: "It's a very long story," but failed to offer any other details.

Kylie Jenner's family are upset at her for dying her hair blue just before Kim Kardshian's wedding.
The reality TV star unveiled her newly dyed electric blue locks last week, and admits her firebrand mother Kris Jenner was upset she had made such a bold fashion choice so close to her half-sister's wedding this weekend.
She told E!: "One day I was just like, 'I'm going blue'. They're all really p****d. My mom was like 'you look like a Skittle [candy].' I was like, 'I'm gonna have this for two years now that you said that.' "
Apart from the drama over her hair, Kylie, 16, added she's looking forward to the wedding, which is thought to be taking place in Florence, Italy on Saturday (24.05.14).
She said: "We are very excited, of course sister getting married is always exciting."
Perhaps Kris, 58, is overreacting a little, as Kylie's hairdresser, Daniel Moon, claims she will be able to go back to her dark brunette tresses in time for the wedding.
Speaking about her new hairdo, he said: "Punk is the new pretty and pretty is the new punk. She made my job easy.
"She came in asking for blue or green hair, and was very aware of the effect the chosen shade would have on her skin tone, and how it would fade. I recommended using more than one colour to add dimension and she agreed."

Kim Kardashian and Kanye West spent $8,000 in a pre-wedding splurge in Paris.
The happy couple - who are set to wed in Florence, Italy, this weekend - were spotted in the French capital browsing its designer stores ahead of their big day.
A source told E! news they were "gazing in shop windows and popping in and out of their favourite stores. Kim was smiling non-stop."
After browsing the boutiques of Saint Laurent, Versace, Miu Miu and Balenciaga without making purchases, the rapper and the reality star bought a few items from Céline.
A bystander said: "Kanye was very supportive and would lend his fashion expertise while Kim was trying on clothes.
"She tried on a couple of asymmetrical skirts, gray sweatpants, and a gold square bracelet."
Kim, 33, bought a $5,600 black skirt with pom-pom embellishments and navy and white stripped skirt for $2,100 as well as a long army green skirt. She also took home a pair of new Mask sunglasses in orange for $420.
Ahead of the wedding, the couple are having a party in Paris at the Chateau Louis XIV, and have reportedly filled a pool with special pink water to impress guests as well as installing a huge air freshening system into the building as it is situated close to a major sewage works.
The duo are expecting some 200 guests, including Kim's huge family and Kanye's best friend Jay Z and his wife Beyonce.