Who’s More Devious on Gossip Girl: Juliet or Georgina?

Never before has anyone on Gossip Girl challenged Georgina for sheer evilness, but in last night's episode, Juliet stepped up. Even her convict brother looked a little afraid of her after she poisoned Serena and Gaslight-ed her into thinking she'd done it to herself. But is it enough to dethrone Georgina, the original princess of darkness, who tried to pin Serena for murder and convinced Dan he was her baby daddy? On the Upper East Side, who's the biggest bitch on the playground?