MONDAY, DECEMBER 20
"GOSSIP GIRL" - (9:00-10:00 p.m. ET)
"War At The Roses" (TV-14, S) (HDTV)
BLAIR'S BIRTHDAY PARTY/MUSICAL PERFORMANCE BY ROBYN - Blair (Leighton Meester) is caught off-guard - and not in a good way - by a surprise guest at her birthday party. Having had enough of Chuck (Ed Westwick) and Blair's games, Serena (Blake Lively) and Nate (Chace Crawford) decide to plan an intervention. Musical guest Robyn performs in the episode. Penn Badgley, Taylor Momsen, Jessica Szohr, Kelly Rutherford and Matthew Settle also star. Joe Lazarov directed the episode written by Jessica Queller (#407).