It's a Wonderful Lie

Jenny discovers that Vanessa has been dating Nate in secret, sparking a feud between the girls. Jenny turns to Nelly, Hazel, Penelope, and the rest of Blair posse of 'mean girls' to humiliate Vanessa at the annual Snowflake Ball involving a special see-though dress. Meanwhile, Aaron's ex-girlfriend, Lexi, arrives in town for a visit sets her sights on Dan, causing Serena to question her feelings towards him as well as Aaron. Chuck and Blair bet that each can choose ideal dates for the other. Also, Lily admits that she wants to leave Bart and would like to rekindle her romance with Rufus. Bart Bass continues investigating Lily and finds a disturbing fact. —Melissa