The O.C. Cast: Then & NowSee how Mischa Barton, Adam Brody, Rachel Bilson and more have changed since their days in Newport Beach


Then: Barton's on-screen mom, the ever-conniving (but always comedic!) Julie Cooper, had it going on – even when she had to trade in her mansion for a trailer park.
Now: Clarke hasn't completely abandoned her antagonizing ways, and on her current show, The CW's Nikita, she plays Amanda Collins, the master manipulator of a hush-hush government-funded organization.