Rachel Bilson & Adam Brody
This list would not be complete without everyone's favorite on-screen couple, Summer and Seth, from The O.C. They dated IRL for three years, but unfortunately ended their relationship in 2006, a year before The O.C stopped filming. Fast forward to now, Adam Brody is married to Leighton Meester, and Rachel Bilson has welcomed her new daughter with Hayden Christensen.
[Photo via @theoc.official]
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