Gossip Girl Preview: Dan and Blair Are Exposed in Season 4, Episode 18, "The Kids Stay in the Picture" Tweet March 1, 2011 by Laura Related: Gossip Girl, Previews and Promos , Blair Waldorf , Dan Humphrey , Season 4 Episode 18 Credit: Blair: "I kissed someone. It was truly a life-changing experience. One kiss changed me." Romance and scanal are afoot on the UES! | Original Air Date: April 18, 2011
