OK, we're kind of excited about Madonna's Material Girl collection for Macy's. The collection, which has been hyped up with the same force as an upcoming Madonna album, debuts August 3, and we can't help but to surrender. With just a little over a month to the collection debut, Madonna wants us to guess the mystery Material Girl modeling her line. We think it's either Taylor Momsen — who can deny those signature platinum blond locks? — or hot off the press Dree Hemingway. Who do you think it is?