American Idol Appearances

Jennifer Lopez, Gwen Stefani, Tony Bennett, Diana Ross and Bon Jovi are among nine musical stars who are to appear on "American Idol" this season. Others who are to appear as coaches or guests of the hit show will include former Bee Gee Barry Gibb, country singer Martina McBride, Scottish singer Lulu and Peter Noone of Herman's Hermits, host Ryan Seacrest announced on the show on Thursday.
Former "Idol" winner Carrie Underwood and former finalist Kellie Pickler also will perform on the show.