NATE THROWS A VALENTINE’S DAY BASH / ST. VINCENT PERFORMS – It’s Valentine’s Day on the Upper East Side and Blair can’t resist playing cupid for someone she loves. Georgina is intent on stirring up more drama, so she decides to crash Nate’s Valentine’s Day party. Meanwhile, Serena is shocked by something she witnesses at the party. Penn Badgley, Ed Westwick, Kaylee DeFer, Kelly Rutherford and Matthew Settle also star. Matt Penn directed the episode written by Austin Winsberg.