The best evidence that the 2000s are well in the past is the show "The O.C." and its what-happened-to-those-guys cast. America fell in love with the cast as stars Adam Brody and Rachel Bilson started dating in real life during the first season in 2003. They were besties in love and they even adopted a pit-bull terrier together before they called it quits on 2006. Since then, she's had an on-and-off thing with Hayden Christensen and he's somewhere walking a pitbull terrier.