In this clip from an unprecedented Gossip Girl event, Serena has it out with Blair over a rumor that got started... most likely involving Serena being preggers. "A Thin Line Between Chuck and Nate" looks like it will shape up to be a great episode!
Eleanor: Are you all right? Blair: Never been better. Eleanor: Well, Serena has. What's wrong? Blair: I don't know. I can't be held responsible for her mood swings. Eleanor: Were you arguing about the possibility that your condition may have returned. Blair: No. It hasn't. Eleanor: I heard you the other day in your bathroom with the water running. Blair: I'm very stressed. And with you and Serena down my throat I can hardly see straight, never mind keep food down.