This is what it says on Who What Wear Daily:
Mary-Kate Olsen: Alexander Wang Handbag ($850)
We imagine that there's no finer compliment for a handbag designer than seeing Mary-Kate Olsen toting your creations. As such, the competition is fierce to get the latest and greatest purses into the style icons hands. Right now, Alexander Wang is leading the pack, as Olsen's been spotted in Manhattan with one of his amazing studded totes on her arm. The bag is as fresh as you can get—literally, it's from his upcoming Fall 2009 collection—and is not yet available to the public