Ooh, nipple-y! Beyonce's "Mrs. Carter Show" World Tour kicked off in Belgrade, Serbia, last night, which means we finally -- finally! -- got a look at the costumes. The confirmed designers who contributed their wares to Beyonce's tour closet include Julien Macdonald, Dsquared2, and Pucci. Click through to see what Bey rocked for her first night on stage, starting with this little sequined faux tits-and-abs number...