Gossip Girl Season 4 Episode 20 can be watched on Monday, 02 May 2011 at 9:00pm EDT on WPIX (CW) TV channel. Title of the brand new episode is: The Princesses and the Frog. Synopsis of the episode is: Serena jeopardises Blair's happiness by dredging up information from her past, while Charlie befriends Vanessa - who may have a hidden agenda. After discovering a shocking secret, Nate is torn between his relationship with Raina and his friendship with Chuck.
