Watch Gossip Girl Season 4 Episode 19 online via TV Fanatic with over 5 options to watch the Gossip Girl S4E19 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, and Google Play.
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Serena enlists Charlie to go undercover Gossip Girl-style to determine why Dan and Blair are spending so much time together. Chuck makes a devastating discovery of his own.