Snapped on Set: Leighton Meester & Ed Westwick Have the Blues (PHOTOS)

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Why so blue, Leighton Meester?

The 25-year-old actress and her co-stat Ed Westwick were seen on the set of Gossip Girl in NYC on Monday, and both were looking dapper as per usual.

Leighton was in head to toe blue, while Ed’s suit was rather tame for normally fashion forward Chuck Bass.

Check out the rest of the photos in the gallery!