by Jenna GuillaumeBuzzFeed Contributor If the chemistry is right between actors, sparks fly onscreen - and sometimes offscreen, too. Here are some costars who actually started dating in real life while working together... 1. Kit Harington and Rose Leslie fell in love while playing enemies-to-lovers Jon Snow and Ygritte on Game of Thrones. "If you're already attracted to someone, and then they play your love interest in the show, it becomes very easy to fall in love," Kit said. HBO The pair are still together after marrying in 2018. They have two kids. Dimitrios Kambouris / Getty Images 2.