Blake Lively kept warm in a puffy jacket and boots on the set of Gossip Girl in NYC yesterday. The cast of the TV series celebrated hitting the 100 episode mark over the weekend, and Blake was joined by costars Leighton Meester, Chace Crawford, Ed Westwick, and Penn Badgley to recognize the milestone. They partied at Cipriani Wall Street on Saturday, just a few days before their latest dramatic Gossip Girl episode aired. Blake's busy social schedule didn't end there since she also hit the town for the launch of Lady Gaga's Workshop at Barneys this week. The whimsical opening included an appearance by Gaga herself, though Blake also made a statement in a bright blue Elie Saab suit.