S2, E25: At the Constance Billard and St. Jude graduations, Gossip Girl livens things up by sending out a shocking and damaging email blast in the midst of the commencement ceremony, stirring Serena to come up with a plan of attack. The Mean Girls (recurring guest stars YIN CHANG, NICOLE FISCELLA, AMANDA SETTON and DREAMA WALKER) challenge Jenny to throw her hat in the ring to succeed Blair as Queen Bee next year, and Lily and Rufus struggle to repair their relationship after Lily's betrayal. Plus, the season finale is rife with cliffhangers: Blair and Chuck finally … Serena is shocked by … Georgina (recurring guest star MICHELLE TRACHTENBERG) decides to … And Dan, Nate and Vanessa unknowingly …. OMG!