Life & Style's Scene Queens can exclusively reveal that Leighton Meester's ex, Gossip Girl star Sebastian Stan has quietly been seeing Glee actress Dianna Agron. "They've been going out on dates in NYC," a source tells Scene Queens. "It started as just a hookup, but now they're dating." Sebastian is trying to keep his new romance much quieter than his relationship with Leighton Meester, who he felt was constantly trying to be in the press and gain publicity. "Sebastian doesn't want to make same mistakes with Leighton, she was so public, he's more focused on his own career right now and wants to just have fun with Dianna without it being this big thing." Sebastian's career may be getting a boost soon; his new film Black Swan, which stars big-guns like Natalie Portman and Winona Ryder is set to be released in late fall.

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