The cast of Gossip Girl was back to work in the Big Apple yesterday, filming at multiple locations around town. Blake Lively changed from green shorts and a sweater into sequins and a flowy skirt, while Leighton Meester, in a camel fascinator and leopard-print shift, teamed up with Ed Westwick at Central Park's duck pond. Chace Crawford got back to work as well, sharing an exchange of words, and hot kisses, with returning face Kaylee DeFer. The small-screen costars went their separate ways over the Summer. Blake vacationed in Europe and recently visited Leonardo DiCaprio in Australia, as Leighton promoted Vera Wang's latest fragrance, Love Struck, and talked makeup tips with BellaSugar. The entire gang has been steadily working for the past month, on both coasts, for what's sure to be an exciting return on Sept. 26 following their jaw-dropping season four finale.