Georgina was played by the actress Michelle Trachtenberg, who was found dead at 39 in her Manhattan apartment on Wednesday. Her performance as the teenage supervillain brought an arch flair to a character who was only a minor figure in the novels that were the basis for the show, but became a fan favorite onscreen.

Blair Waldorf? Serena van der Woodsen? Let's be real, the best Upper East Side mean girl was always Georgina Sparks on Gossip Girl.

Georgina Sparks may not have been Gossip Girl, but her wardrobe embodied that of actor Michelle Trachtenberg, who passed away at age 39 on Wednesday, February 26, at her New York City apartment. Her cause of death is currently unknown.