Blake Lively wore Marchesa and posed with young actress Chloe Moretz on the red carpet in NYC last night to celebrate her series Gossip Girl making the 100 episode mark! The bash was held at Cipriani Wall Street, and many of Blake's small-screen costars like Leighton Meester, Chace Crawford, Ed Westwick, and Penn Badgley also attended. Kelly Rutherford and Matthew Settle did as well. The latest Gossip Girl episode was as full of drama and OMG moments as back when the show started in 2007. The Upper East Siders have come a long way since then, though, with recent pictures from the set showing Leighton's Blair Waldorf as a runaway bride! Congrats to the cast on their latest big accomplishment.