The Cheaters: Abbie Cornish and Ryan Phillipe

The Details: Bubbly blond movie darlings Ryan Phillipe and Reese Witherspooon met at her 21st birthday party, married following the release of their movie Cruel Intentions, and has two children together. That ended in 2006 when the couple announced they were separating. But before that announcement, Ryan was allegedly seen cavorting with costar Abbie Cornish, who he met on the set of their film Stop Loss. Ryan claims they're "just good friends," but he's been spending an awful lot of time with the stunner from Down Under.
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