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Mischa Barton
Mischa Barton has had quite a few ups and down since her Marissa Cooper days. Barton had some roles following The O.C., but none of them really hit it out of the park. In 2007 she was arrested for a DUI, and in 2017 she voluntarily entered psychiatric care. Now, in 2019, Barton will be returning to TV as part of The Hills reboot alongside Heidi Montag, Spencer Pratt, and Audrina Patridge.