WEDNESDAY, FEBRUARY 17

"GOSSIP GIRL" - (9:00-10:00 p.m. ET)

"The Treasure of Serena Madre" (TV-14, DL) (HDTV)

THANKSGIVING ON THE UPPER EAST SIDE - It wouldn't be Thanksgiving on the Upper East Side if there wasn't a serving or two of some major drama for the holiday. Blair (Leighton Meester) suspects her mom (guest star Margaret Colin) has been keeping a big secret from her, but it turns out to be something else entirely. Vanessa (Jessica Szohr) is supposed to spend Thanksgiving with her parents, but has a fight with her mom (guest star Gina Torres) and shows up on Dan's (Penn Badgley) doorstep. Rufus (Matthew Settle) learns that Lily (Kelly Rutherford) has been lying to him about her mother, Cece (guest star Caroline Lagerfelt). Chuck (Ed Westwick) tells Nate (Chace Crawford) that he has some potentially damaging information about one of their friends. Jenny (Taylor Momsen) learns that Eric (Connor Paolo) was behind her very public embarrassment at Cotillion and can't pass up a chance to get even. Serena (Blake Lively) is put in a very awkward position when her mother invites Trip (guest star Aaron Tveit) and Maureen (guest star Holley Fain) to join them for Thanksgiving dinner. Mark Piznarski directed the episode written by Robert Hull & Joshua Safran (#311).