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Anna Kendrick revealed that shuttling between the Twilight and Up In The Air sets sparked a major rivalry between two of the hottest men in Hollywood.

Well, more of a practical joke rivalry, anyway.

"George gave me such a hard time about shooting Twilight," Kendrick told Ellen Degeneres. "Whenever I came back, it was like, 'Oh sorry, this isn't the Twilight set. You're not working with Mr. Handsome.' He called Rob 'Mr. Handsome.'"

So what did Kendrick do to fight back against Hollywood's most notorious prankster?

She got Rob to sign his GQ issue, with a personal note that read, "To George, Best of Luck. Hang in there. Love Rob."

But Clooney hit back, signing his own Esquire cover, "Dear Rob, Thanks for all the inspiration. I'm a huge fan. Love, George, two-time 'Sexiest Man Alive.'"

Sorry George, you're a silver-haired fox, but I think Rob's got you beat in the hotness category!