Baby got back! Nina's got a great eye! When she sent us this pic of an Olsen twin (sorry, we can't tell which one), we immediately went on a hunt to discover its origins. This Alexandra Cassaniti backpack ($320) is like a premonition of the next big thing for Fall 2008 in handbags. The backpack is back! For those you not quite ready to face the return the backpack, just remember the power of the Olsen's trend-setting capability. When Mary Kate was spotted in the spring of 2007 in a pair of Chanel knee-high gladiators, the public reacted with a unanimous yuck. One year later everyone and their mother are sporting the gladiator sandal. We think we see a backpack in your near future!