Gossip Girl Season 6 Spoiler Photos: Serena and Blair Scream at Each Other on the Street (PHOTOS)

Photographers spotted Leighton Meester (Blair) and Blake Lively (Serena) in Madison Square Park on August 3 filming a scene for Gossip Girl Season 6, Episode 3 after dark — and their two characters did not look happy! What could Blair and Serena possibly be fighting about this time?

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