Blake Lively And Ryan Reynolds Met While Doing A Movie Together—But He Wasn't Her First Costar Boyfriend

Sometimes your favorite on-screen couples take that initial attraction and see where it goes IRL. Sometimes it ends poorly (sorry, Kristen Stewart and Robert Pattinson). On other occasions, it ends in happily ever after (Blake Lively and Ryan Reynolds, ILY). But *100 percent* of the time, it makes for a great love story to follow and reminisce about for dedicated, hopelessly romantic pop-culture fans.

From Ben Affleck, who has gone googly eyed for three of his costars, to iconic couples like Goldie Hawn and Kurt Russell, here are the biggest celebrity relationships that started on set. Juicy!