Guest Stars Fantasia Barrino as Herself Ruben Studdard as Himself Carrie Underwood as Herself David Cook as Himself Jordin Sparks as Herself Lee DeWyze as Himself Phillip Phillips as Himself Scotty McCreery as Himself Kris Allen as Himself Taylor Hicks as Himself Kelly Clarkson as Herself Caleb Johnson as Himself Candice Glover as Herself Nick Fradiani as Himself Trent Harmon as Himself Lauren Alaina as Herself Katharine McPhee as Herself Jennifer Hudson as Herself Danny Gokey as Himself Paula Abdul as Herself Steven Tyler as Himself Kellie Pickler as Herself Clay Aiken as Himself Colton Dixon as Himself Elliott Yamin as Himself Nicki Minaj as Herself Kimberley Locke as Herself Blake Lewis as Himself Randy Jackson as Himself Allison Iraheta as Herself Bo Bice as Himself Carly Smithson as Herself Constantine Maroulis as Himself James Durbin as Himself Melinda Doolittle as Herself Justin Guarini as Himself William Hung as Himself Jessica Sanchez as Herself Casey James as Himself Ellen DeGeneres as Herself Simon Cowell as Himself Barack Obama as Himself Brandon Rogers as Himself Bucky Covington as Himself Diana DeGarmo as Herself Chris Daughtry as Himself Ace Young as Himself Pia Toscano as Herself Tamyra Gray as Herself George Huff as Himself Clark Beckham as Himself Joshua Ledet as Himself Kree Harrison as Herself LaToya London as Herself Amber Holcomb as Herself Brian Dunkleman as Himself Kara DioGuardi as Herself Sanjaya as Herself Skylar Taine as Himself Marley Fletcher as Himself