Leighton Meester is Lex Lovely

Leighton Meester throws a pretty dress on and heads to the New York City set of Gossip Girl with her younger brother Lex on Monday morning (August 24).

Costar Blake Lively was also seen shooting scenes at Gramercy Park.

Leighton is expected to present a moonman award at the 2009 MTV VMAs, which will air live on Sunday, September 13, 2009 @ 9PM ET/PT.

10+ pictures inside of Lex lovely Leighton Meester…