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Bradley Cooper, Jennifer Esposito
When Bradley Cooper and Jennifer Esposito got engaged in 2006, the public barely knew who they were -- or that they were even an item. In May 2007, they tied the knot, but the "Blue Bloods" actress filed for divorce just four months later. Since then, his fame has grown thanks to "The Hangover," and he's been able to snag more high-profile girlfriends, like Renee Zellweger, Jennifer Lopez, and his current main squeeze, Zoe Saldana.

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