PHOTOS: Girls of Gossip Girl Get Up to No Good

What could Serena and Blair be discussing?

Gossip Girl stars Leighton Meester and Blake Lively share a few laughs and maybe more than a couple of secrets while shooting the upcoming season of the hit show on the steps of the Metropolitan Museum of Art on Monday.

Also out and about in the Big Apple shooting yesterday was co-star Ed Westwick.

37 PHOTOS OF THE GOSSIP GIRL CAST IN THE GALLERY!