In the third season finale, Blair must decide whether to meet Chuck at the top of the Empire State Building or risk losing their future together. A Gossip Girl gossip bomb involving Dan explodes Serena and Nate's relationship. Dorota (recurring guest star ZUZANNA SZADKOWSKI) and Vanya (recurring guest star AARON SCHWARTZ) welcome their baby. Jenny hits rock bottom. Plus, Georgina (recurring guest star MICHELLE TRACHTENBERG) returns to the Upper East Side ... and she has an agenda.