Michelle Trachtenberg looks so pretty as she attends the GUESS Flagship Boutique opening in NYC hosted by Marie Claire.  Fans of Michelle’s will be seeing lots more of her on Gossip Girl as she returns to reprise her role as Blair’s freshman year roommate.

Also attending the event, Kanye West’s girlfriend and model Amber Rose, Real Housewives of New York star Kelly Benismon, Paula Garces, Alexandra Richards, Lydia Hearst and Selita Ebanks.

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Photos:  WENN.com