Matt Damon has revealed George Clooney can't get enough of his butt.The sexy actor says his 'Syriana' co-star pinches his pert behind at least once a day. The blonde star quipped Clooney's sexual advances are the reason why the pair have starred in so many films together.He said: "George grabs my ass every day. At least once a day. That's why I've done three movies with him"But during the making of the movie, Clooney became so depressed after piling on the pounds for his role, Damon found he was no longer the centre of his attention.He added to America's Cinema Confidential website: "George is normally so fun and vibrant--like grabbing my ass - but during the shoot he really wasn't He was very serious"

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