What do you think of co-stars dating? Good idea or bad idea? Would you do it in that situation? I think it is a lot different than actors meeting and dating while on the set of a movie. Adam Brody (Seth) and Rachel Bilson (Summer) of The O.C. dated from season 1-3 and then broke up before the fourth and final season of the show. It got me thinking about this, since they were still playing the main couple and had TONS of scenes together - how hard that must've been? And I think you can notice. I think Brody and Bilson are good actors, but how do you hide something like that?