Spotted: future princess Blair Waldorf getting into some mischief in NYC's Greenwich Village.

A tipsy-looking Leighton Meester, 25, was handcuffed by a police officer Wednesday -- but it was just for show. The actress was actually shooting scenes for an upcoming episode of Gossip Girl (presumably for her character's bachelorette party, given the bride-to-be tiara on her head).

With an impending pregnancy and trouble brewing between the royal family, the rest of the season is shaping up to be the series' juiciest yet.

"Keep watching," Meester told Us Weekly at the Roger Vivier cocktail party in NYC Tuesday. "You won't see what's coming!"