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 costars Taylor Momsen and Chace Crawford have been enjoying NY Fashion Week, but after her time in Paris perhaps she's all runway-ed out for now. From the Super Bowl to Letterman in one week, still pretty impressive for Miss Lively.