10. Mischa Barton
Mischa Barton became a huge star when she was on The O.C. But she chose to leave the show early (they killed off her character, Marissa) so she could focus on a film career. Unfortunately, that didn’t really happen.
Instead, she ended up partying too much, and was charged with a DUI in 2007. She also gained a lot of weight, causing people to ask what happened to the formerly petite “It Girl” of 2003.