MONDAY, FEBRUARY 11

"GOSSIP GIRL" � (8:00-9:00 p.m. ET)

"Poison Ivy" (TV-PG, DL) (HDTV)

IVY WEEK EQUALS DRAMA � As the Upper East Side teens from Constance Billard and St. Jude's prepare for a much-anticipated visit from the Ivy League representatives, Blair (Leighton Meester) uncovers a scandalous secret about Serena (Blake Lively) that may not remain a secret much longer. Dan (Penn Badgley) has his heart and future set on the coveted usher position for the Dartmouth rep, only to be beat out by Nate (Chace Crawford), who has no interest in the school despite pressure from his controlling father, The Captain (Sam Robards). Meanwhile, Jenny (Taylor Momsen) bonds with Serena's younger brother, Eric (Connor Paolo), and Rufus (Matthew Settle) must swallow his pride and ask Lily (Kelly Rutherford) for a favor to help his son, Dan. Ed Westwick also stars. J. Miller Tobin directed the episode written by Felicia D. Henderson (#102).