Rachel Bilson and Adam Brody
The O.C. fans rejoiced when the show's most endearing couple, Seth Cohen and Summer Roberts, got together off screen in 2003. Adam Brody and Rachel Bilson were a truly adorable pair, and some of us still haven't recovered from their 2006 breakup. Rachel went on to date Hayden Christensen, while Adam found love with another TV darling, Leighton Meester.