Calling all dancers—Madonna wants you to help her launch her and Lourdes' Material Girl Collection! Auditions to dance at the line's launch party at Macy's Herald Square on September 22nd are being held tomorrow at the Broadway Dance Center in N.Y.C., where a panel of judges—including Madonna's lead dancer Leroy "Hypnosis" Barnes—will choose 20 semi-finalists based on one-minute dance routines. (Note: All dancers must be between the ages of 18 and 27 to participate.) But make sure to arrive on time, only the first 150 contestants will get to audition. Not based in New York? Just upload your best moves to youtube.com/materialgirlcol by September 3rd for a chance to be considered. The final ten will be chosen by Madonna herself, so start getting your "Vogue" on now.