This week’s challenge has the two fashion houses creating collections for a modern day “femme fatale” where the designs must be appropriate for night clubs, lairs and other after-hours haunts. Their muse and guest judge? Burlesque model and actress Dita Von Teese is at the helm to see if they capture the essence of her staple look. And while the designers get into touch with their inner seductress, they must also adapt to some last-minute curveballs –can they handle what is thrown their way? Find out tonight 11/23 @ 10/9c BRAVO’s The Fashion Show: Ultimate Collection.