Who: Mary Kate Olsen

Where: MKO made a fashionable appearance at New York City’s Saks Fifth Avenue, where she celebrated the opening of the store’s new fifth-floor Contemporary space. For the occasion, MK picked her totally awesome studded Alexander Wang bag, from his upcoming Fall 2009 collection.

If you want to get your hands on MK’s hot studded bag, I would keep checking back at barneys.com. Retail: $850

image: splashnews