The re-opening of Chanel's SoHo boutique went down in NYC last night -- where the cast of "Gossip Girl" was spotted wearing the designer duds.

Blake Lively and Leighton Meester were decked out in clothes from Chanel's Fall 2010 collection -- and hung out with Karl Lagerfeld at the event.

Sarah Jessica Parker, Chace Crawford, Rachel Bilson, Penn Badgley, Courtney Love, Claire Danes, Liv Tyler and many more were all on hand for the fashionable sioree -- check out the party pics!

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