Season four wraps up with an explosive finale, including the return of Georgina Sparks and Constance Billard mean girls Kati and Is, a cameo by "Gossip Girl" author Cecily von Ziegesar, a performance by Airborne Toxic Event and, oh yeah, a few very juicy cliffhangers. Written by
Did You Know?
Cecily von Ziegesar
[to Serena, who Headmistress Queller introduced her to
We've never met, but I've read a lot about you.
References The Long Goodbye
Performed by The Airborne Toxic Event See more