The CW has also released promo photos and a synopsis for the November 1 new episode, which you can view below.
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.