Though he doesn't directly name his Gossip Girl costar and ex-girlfriend Leighton Meester, the two dated from 2008 to 2010. Stan — who played Carter Baizen on Gossip Girl — appeared in 11 episodes from 2007-2010. He's avoided publicly discussing his relationships over the years, but he spoke highly about Meester during their time together.

In an interview with Variety, Sebastian Stan took a look back at his time starring in "Gossip Girl," revealing that he was "in serious love" for the first time while appearing on the show.