"Gossip Girl" stars Leighton Meester, Blake Lively and newcomer Katie Cassidy were all snapped on set yesterday wearing equally gorgeous gowns ... but which is your favorite?
Check out the gallery to get a closer look at Leighton's floral print, Lively's lace and Cassidy's sheer back -- plus shots of Chace Crawford and Ed Westwick all dressed up -- then let us know ...
