7 Celebrities You Forgot Were on 'The O.C.'
The O.C. ran for only four seasons and 92 episodes but the teen drama had more than its fair share of A-list celebrity guest stars. This actress played Alex Kelly, Marissa Cooper's love interest. This actor played an activist named Ché who attended Brown University with Summer Roberts. This actress played Marissa's little sister, Kaitlin Cooper. This actor played the younger version of Peter Gallagher's Sandy Cohen. The entire cast of Pretty Little Liars got their start on the hit Fox soap.