Libby Chesler was the original mean girl. It's been thirteen years since Sabrina The Teenage Witch wrapped, but in fairness it had lost a lot of its sparkle prior to that. Us true Sabrina fans remember the golden days, when Harvey Kinkle was the main squeeze, mitosis was a big problem and Libby Chesler was our ARCH nemesis. Libby was played by Jenna Leigh Green, and - we couldn't believe this - disappeared after only the third season of the show. She went on to focus on theatre, appearing in the hugely popular Wicked on Broadway playing Nessarose and understudying the role of Elphaba, made famous by Idina Menzel. She has also made appearances on shows like Cold Case, ER and Bones.  Here she is as Nessarose on Broadway... https://www.youtube.com/watch?v=Y6mel30U_m8 Video via YouTube/Lirulin Arinya