NEW YORK (AdAge.com) -- The lineup for Conde Nast Media Group's fourth annual Fashion Rocks show will include Usher, Avril Lavigne, Jennifer Hudson, Ludacris, Jennifer Lopez, Carrie Underwood, Fergie, Fall Out Boy, Santana, Aerosmith and Martina McBride, the company said today. If there's any friction among the wide range of acts, Jeremy Piven will be on hand to host and possibly offer tension-reducing hug-it-out jokes from "Entourage."