Blake Lively went casual with the outfit, but all done up with the hair/makeup on her way in to tape her first ever appearance on Late Show with David Letterman yesterday afternoon. Methinks she changed into something a little more fancy once she got inside, but I guess we'll just have to wait and see since the interview doesn't air until Friday night. Her Gossip Girl [1] costars Taylor Momsen and Chace Crawford [2] have been enjoying NY Fashion Week, but after her time in Paris [3] perhaps she's all runway-ed out for now. From the 
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