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 Paula Abdul as Herself Steven Tyler as Himself Clay Aiken as Himself Kellie Pickler as Herself Danny Gokey as Himself Elliott Yamin as Himself Nicki Minaj as Herself Randy Jackson as Himself Constantine Maroulis as Himself Blake Lewis as Himself Allison Iraheta as Herself Bo Bice as Himself Carly Smithson as Herself Colton Dixon as Himself James Durbin as Himself William Hung as Himself Justin Guarini as Himself Kimberley Locke as Herself Jessica Sanchez as Herself Casey James as Himself Ellen DeGeneres as Herself Simon Cowell as Himself Barack Obama as Himself Kara DioGuardi as Herself Chris Daughtry as Himself Ace Young as Himself Brian Dunkleman as Himself Tamyra Gray as Herself Pia Toscano as Herself Melinda Doolittle as Herself Sanjaya as Herself Skylar Taine as Himself Clark Beckham as Himself LaToya London as Herself Kree Harrison as Herself Joshua Ledet as Himself George Huff as Himself Amber Holcomb as Herself Brandon Rogers as Himself Marley Fletcher as Himself Bucky Covington as Himself Diana DeGarmo as Herself