Chace Crawford and Katie Cassidy are filming scenes for the 4th season of Gossip Girl in New York where they showed a lot of PDA and oops Katie’s undies as well. You can only hope when a shot up your dress gets out on the interwebs that you have coiffed the privates.  Know what I’m saying?

Season 3 of Gossip Girl is now available on DVD and Season 4 premieres Monday, September 13, 2010 at 9/8c.

Pictures after the break

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Photos:  Patricia Schlein/WENN