Appeared on the late show with David Letterman last night, Gossip Girl star Blake Lively was snapped arriving at the studios as herself in a casual style.

But afterwards she emerged from the show to sign autographs and she was all dressed up as hottie character Serena Van der Woodson!

She looked so great in this one-sleeved magenta satin mini dress! We especially like the ruffled detailing on the shoulder of this a-symetrical dress.





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