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2. Emily VanCamp and Chris Pratt

HOLLYWOOD - OCTOBER 25: Emily Vancamp and Chris Pratt at the launch for the Xbox 360 game "Gears of War" on October 25, 2006 at Hollywood Forever Cemetery, Hollywood, CA.
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VanCamp and Pratt’s love affair began and ended long before the latter became famous for Guardians of the Galaxy and Parks and Rec. . You may recall the two played sister and brother in the TV show Everwood. Onscreen sibling affection quickly turned into a real life love affair that lasted for two years. Pratt moved onto other stars, but VanCamp never quite got over her addiction to dating her sibling co-stars.

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