Sandra Bullock & George Clooney Never Dated: What Other Actors With Great Chemistry Haven't?

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Sandra Bullock and George Clooney's new movie Gravity is already getting rave reviews. But, while Bullock is out making the press rounds, she's not just getting asked about the movie. She's single, Clooney's single, so the obvious question is... are you guys dating, or what?

Clooney and Bullock have been friends for a long time, so it was easy for her to dispel the rumors, citing that the two are just too similar to date. It seems like everyone talks about the real-life couples who flopped on film, but what about the couples who did well on film, but never actually dated?

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