It was announced on American Idol last night that a bunch of guests would be visiting the show this season. Most notably, Gwen Stefani, Jennifer Lopez and Diana Ross. Other's include: Jon Bon Jovi, Martina McBride, Barry Gibb and '60s stars Lulu and Peter Noone from Herman's Hermits. It's good that the show is trying to mix things up this season, but it was unclear if the guests will appear as