Flashback! Stars Who Stopped by The O.C.In honor of the hit show's 10th anniversary, see which soon-to-be-famous faces hit the beach with Mischa Barton, Benjamin McKenzie, Rachel Bilson and Adam Brody


The Parks and Recreation funnyman joined The O.C. during its fourth and final season as Ché, a Brown University classmate of Summer Roberts's (Bilson) who introduces the once-spoiled rich girl to activism, causing tension in her relationship with Seth. "I just had the funnest day," he told the Houston Chronicle while filming in 2006. "There were rabbits, and I played a flute. It all sounds so ridiculous, but it was fun."