Fashion and music will collide on a star-studded night of style and sound at the 4th annual Fashion Rocks. Hosted by Jeremy Piven, it will feature performances by Aerosmith, Fergie, Jennifer Hudson, Alicia Keys, Avril Lavigne, Jennifer Lopez, Ludacris, Maroon 5, Martina McBride, Santana, Carrie Underwood, Usher and special guests.