Season 4 Episode 15

full size Blair and Serena in Season 4, Episode 15: "It-Girl Happened One Night"
Credit: Giovanni Rufino/The CW © 2011 The CW Network, LLC.

Title: It-Girl Happened One Night
Air Date: February 14, 2011 at 9:00 PM PST

With Russell Thorpe (Boatman) poised for a takeover attempt of Bass Industries, Chuck makes one last-ditch effort to save his family’s company. Blair is given a challenging assignment at W Magazine with the promise of a possible promotion.  Serena struggles with her feelings for Ben. Read the full recap here.