Pin for Later: 18 Actors Who Couldn't Seem to Stop Dating Their Costars Gossip Girl costars Leighton Meester and Sebastian Stan dated for two years before their split in 2010.

Gossip Girl costars Leighton Meester and Sebastian Stan dated for two years before their split in 2010.

Pin for Later: 18 Actors Who Couldn't Seem to Stop Dating Their Costars Gossip Girl costars Leighton Meester and Sebastian Stan dated for two years before their split in 2010.

Leighton Meester and Sebastian Stan Photo - 15th Annual "Kids For Kids" Celebrity Carnival - Inside

Leighton Meester and Sebastian Stan Photos Photos: 15th Annual "Kids For Kids" Celebrity Carnival - Inside

Leighton Meester and Sebastian Stan Photo - 15th Annual "Kids For Kids" Celebrity Carnival - Inside

photoshoot of sebastian stan | Gossip Girl: elle photoshoot with leighton meester and ed westwick

photoshoot of sebastian stan | Gossip Girl: elle photoshoot with leighton meester and ed westwick

Photos of Gossip Girl's Chace Crawford, Leighton Meester, Ed Westwick, Sebastian Stan at the Knicks Game in NYC | POPSUGAR Celebrity

The Gossip Girl Kids Get Their Kicks With the Knicks

Photos of Gossip Girl's Chace Crawford, Leighton Meester, Ed Westwick, Sebastian Stan at the Knicks Game in NYC | POPSUGAR Celebrity

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