“Glee” starlet Dianna Agron and “Gossip Girl” actor Sebastian Stan have split. The couple, whose romance heated up this summer, called it quits before the holidays because of distance, sources say. Agron has been in LA filming episodes of the Fox hit while Stan has been traveling for work but living here.

PHOTOS: DIANNA AGRON

“Long distance wasn’t working,” a source said. “Dianna’s coming to New York for Christmas with her mom, so they might rekindle the flame.” Agron’s rep didn’t respond.