Blake Lively opted for a super sexy dress for the Gossip Girl 100th episode celebration held at Cipriani Wall Street on Saturday (November 19) in New York City. The dress, designed by Marchesa, was sheer with white tassels to cover Lively in all the “right” places. The 24-year-old actress was joined for the festivities by her “Gossip Girl” co-star Leighton Meester. In this season, Blake’s character Serena plans a bridal shower for Leighton’s character Blair.