Blake Lively opted for a super sexy, sheer 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.

Blake was joined for the festivities by her Gossip Girl co-star Leighton Meester, Michelle Trachtenberg, Chace Crawford,Penn Badgley and Ed Westwick.

Gossip Girl airs on the CW on Mondays. This upcoming Monday, Blake’s character Serena plans a bridal shower for Leighton’s character Blair!

If you missed last week’s episode of Gossip Girl – click here for all the details.