Blake Lively Serena van der Woodsen Actor Leighton Meester Blair Waldorf Actor Penn Badgley Dan Humphrey Actor Chace Crawford Nate Archibald Actor Ed Westwick Chuck Bass Actor Kaylee Defer Charlie Rhodes Actor Kelly Rutherford Lily van der Woodsen Actor Matthew Settle Rufus Humphrey Actor Barry Watson Guest Star Andrea Gabriel Guest Star Michelle Trachtenberg Guest Star Robert John Burke Guest Star Sofia Black-D'Elia Guest Star Josh Schwartz Executive Producer, Writer Stephanie Savage Executive Producer, Writer Leslie Morgenstein Executive Producer Bob Levy Executive Producer Joshua Safran Executive Producer Mark Piznarski Director