Lizzy Caplan's television credits include "Related," "Tru Calling," "Smallville," "Once and Again," "Freaks and Geeks" and "Undeclared." She also starred in the MTV movie "Everybody's Doing It" and has done voice work for the animated series "Family Guy" and "American Dad." Best known to audiences for her role in the feature film "Mean Girls," Caplan's additional credits include roles in "Orange County," "Hardcore Action News" and the upcoming independent films "Love is the Drug" and "Crashing." She portrays Kat in the TV sitcom "The Class." Kat Warbler is Lina's cynical twin sister whose sarcastic tongue may hide her kind heart. She seems to be a photographer. Her birthday is adjacent to Son of Sam's. She helps Ethan cope after he's dumped and despite her cynicism, seems attracted to him.