Hollywood's most famous batchelor, George Clooney is single again after splitting from ex-cocktail waitress Sarah Larson after a year, it has emerged.

Clooney, 47,  and Miss Larson met in Las Vegas nearly four years ago, when the 29-year-old, a former reality show contestant, served at The Whiskey Bar.

But it wasn't until last June that their relationship that the couple began dating.

Now US magazine In Touch has claimed that the former ER star has split with Larson – and that she has been moved out of the mansion they shared in Los Angeles.

Split: George Clooney has split from girlfriend Sarah Larson. They attended the Oscars together in February

A source told In Touch: 'George is relieved to be single again.

‘He thinks Sarah is sweet and that is why was so hard to break up with her.’

A source said the Leatherheads star recently moved out of his LA home so that 29-year-old Larson could be alone as she removed her belongings. 

Clooney and Sarah made their public debut as a couple at the Venice and Deauville film festivals in September 2007.

Later that month, Clooney and Miss Larson were injured in a motorcycle accident after his Harley Davidson was hit by a car in New Jersey.

Clooney, suffered a hairline fracture of a rib and road rash, and Larson, a broken foot.

In February, Larson became the first girlfriend of the star, who has dated Renee Zellweger, Balitran and Lisa Snowdon, accompanied Clooney to the Oscars – the first girlfriend ever to go with him to the event.

But reports recently suggested the couple struggled to make their relationship work because of their different backgrounds. 

'The truth is they had little in common and he just doesn't want to be tied down,' an insider said. 

Earlier this year photographs surfaced of Larson, revealing her raunchy past as a waitress in Las Vegas.

The former model worked as a waitress and bar hostess in Las Vegas prior to meeting the Hollywood star and pictures showed she was quite the party girl before getting together with Clooney.

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Raunchy: Clooney's ex-girlfriend Sarah Larson shows her raunchy side..while on a promotional modelling assignment in 2005

Not much in common: George said they had little in common due to their very different backgrounds

Larson, seen left, plays an unusual game with a model friend

Clooney's spokesperson refused to confirm reports of  the love split.

'I can only confirm that we have never commented on George's personal life,' his spokesperson said.

And perhaps in readiness for his newly single status - the actor is reported to have had his teeth fixed.

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Clooney appears to have had his teeth fixed. Seen left in April, but in May his slightly uneven and yellow teeth have brightened up considerably

Clooney, he was once married to actress Talia Balsam for four years, has famously claimed he will never get married again nor have any children.

But actresses Michelle Pfeiffer and Nicole Kidman each bet him $10,000 that he would be a father before he turned 40.

They were both wrong, and each sent him a cheque for the amount. But he returned the money, betting double or nothing that he won't have kids by age 50.