Ryan Gosling and Rachel McAdams

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It’s true! Although they played the ultimate couple in ‘The Notebook,’ Gos and Regina George hated each others’ guts on the set. According to director Nick Cassavetes, Gosling flat-out refused to do a scene with his co-star, saying, “Would you take her out of here and bring in another actress to read off camera with me?” They got over it though – and even dated IRL.