Self - Host

Ryan Seacrest

Judge

Simon Cowell

Self - Judge

Randy Jackson

Judge

Ellen DeGeneres

Judge

Kara DioGuardi

Victoria Beckham

Self - Judge

Paula Abdul

Contestant

Didi Benami

Self - Judge / Self - Performer

Jennifer Lopez

Mary J. Blige

Kristin Chenoweth

Self - Judge

Keith Urban

Contestant

Crystal Bowersox

Joe Jonas

Contestant

Lacey Brown

Self - Judge

Harry Connick Jr.

Contestant

Michelle Delamor

Neil Patrick Harris

Avril Lavigne

Self - Judge

Steven Tyler

Contestant

Katelyn Epperly

Katy Perry

Contestant

Siobhan Magnus

Self - Judge / Self / Self - Mentor

Mariah Carey

Contestant

Paige Miles

Shania Twain

Contestant

Ashley Rodriguez

Self - Judge / Self - Performer

Nicki Minaj

Contestant

Lilly Scott

Self - Contestant / Self / Self - Auditionee

Phillip Phillips

Self / Self - Guest Performer / Self - Contestant

Kimberley Locke

Self / Self - Contestant

Katie Stevens

Self - Host

Brian Dunkleman

Contestant

Haeley Vaughn

Contestant

Janell Wheeler

Contestant

Lee DeWyze

Self - Contestant / Self

Todrick Hall

Self / Self - Contestant / Self - Musical Guest

Jennifer Hudson

Contestant

Andrew Garcia

Contestant

Tyler Grady

Self - Contestant / Self

Peter Frank

Self / Self - Contestant

Chris Daughtry

Contestant

Casey James

Self / Self - Contestant

Jon Peter Lewis

Self - Guest Host / Self - Contestant / Self - Guest

Clay Aiken

Contestant

Aaron Kelly

Self - Contestant / Self - Guest

Tamyra Gray

Contestant

Alex Lambert

Self / Self - Performer / Self - Guest

Carrie Underwood

Contestant

Michael Lynche

Contestant

Joe Muñoz

Contestant

John Park

Contestant

Jermaine Sellers

Contestant

Tim Urban