American Idol

Ryan Seacrest

Self - Host

Randy Jackson

Self - Judge

Simon Cowell

Self - Judge

Paula Abdul

Self - Judge

Jennifer Lopez

Self - Judge

Keith Urban

Self - Judge

Harry Connick Jr.

Self - Judge

Kara DioGuardi

Self - Judge

Steven Tyler

Self - Judge

Ellen DeGeneres

Self - Judge

Mariah Carey

Self - Judge

Nicki Minaj

Self - Judge

Kimberley Locke

Self

Brian Dunkleman

Self - Host

Katie Stevens

Self

Ronnie Paulley Jr

Contestant

Todrick Hall

Self - Contestant

Chris Daughtry

Self

Clay Aiken

Self - Guest Host

Jennifer Hudson

Self

Ada Vox

Self - Contestant

Barry Manilow

Self - Guest Judge

David Foster

Self - Guest Performer

Kelly Clarkson

Self - Guest

Gwen Stefani

Self

Tony Bennett

Self

Carrie Underwood

Self

Bono

Self

Ruben Studdard

Self - Guest

Stevie Wonder

Self - Guest Performer

Kenny Rogers

Self

Martina McBride

Self - Guest Performer

Jon Bon Jovi

Self - Guest Performer

Kellie Pickler

Self

Reese Witherspoon

Self

Diana Ross

Self - Guest Performer

Fergie

Self

LaToya London

Self

Andrea Bocelli

Self - Guest Performer

Lulu

Self

Bo Bice

Self - Guest

Barry Gibb

Self

Gladys Knight

Self

Dolly Parton

Self - Guest / Mentor

Neil Diamond

Self - Mentor

Jordin Sparks

Self

Jesse Spencer

Self

Ben Stiller

Self

Peter Noone

Self

Smokey Robinson

Self - Guest Judge

Seal

Self - Performer

Hugh Laurie

Self

Matthew Rogers

Self

Tamyra Gray

Self - Guest

Antonella Barba

Self

Shakira

Self - Guest Performer

Heather Locklear

Self

Lamont Dozier

Self - Guest Judge

Olivia Newton-John

Self - Guest Judge

Verdine White

Self - Guest Judge

Lionel Richie

Self - Guest Judge

Billy Joel

Self

Diane Warren

Self - Guest Judge

Neil Sedaka

Self - Guest Judge

Robin Gibb

Self - Guest Judge

Elton John

Self - Mentor

Jason Priestley

Self

Mark McGrath

Self - Guest Judge

Gene Simmons

Self - Guest Judge

LL Cool J

Self - Guest Judge

Queen Latifah

Self

Rod Stewart

Self - Guest Performer

Tori Spelling

Self

Lisa Tucker

Self

Melissa Gilbert

Self

Rebecca Romijn

Self

Clive Davis

Self

Todd Bridges

Self

Meat Loaf

Self - Guest

Jewel

Self - Guest Judge

Anita Barone

Self

Robin Thicke

Self - Performer

Andrew Lloyd Webber

Self - Mentor

Bette Midler

Self

Katharine McPhee

Self - Guest Performer

Céline Dion

Self

Natasha Bedingfield

Self - Performer

Graham Nash

Self - Performer

Rihanna

Self - Performer

Kenny G

Self - Guest

Amaury Nolasco

Self

Jerry O'Connell

Self

Gavin DeGraw

Self

Daniel Powter

Self

Mary J. Blige

Self - Guest

LeBron James

Self

Pink

Self

John Legend

Self

David Cook

Self

Sasha Cohen

Self

Jeri Ryan

Self

Mandy Moore

Self

Burt Bacharach

Self - Guest

Doug E. Fresh

Self

Eli Manning

Self

Christina Applegate

Self

Al Jarreau

Self - Guest

Micky Dolenz

Self

George Michael

Self - Performer

Jim Verraros

Self

Kimberly Caldwell

Self - Guest Host

Jimmy Kimmel

Self - Performer

Jane Kaczmarek

Self - Audience Member (uncredited)

Diana DeGarmo

Self

Dionne Warwick

Self - Guest

Marc Anthony

Self

Annie Lennox

Self

Paul Anka

Self - Guest

Fantasia Barrino

Self

Prince

Self - Guest

Matt Damon

Self

Guy Sebastian

Self - Audience Member (uncredited)

Joel Madden

Self

BeBe Winans

Self

Peyton Manning

Self

Helen Mirren

Self

John McCain

Self

Wolfgang Puck

Self

Helena Bonham Carter

Self

Brad Pitt

Self

CeCe Winans

Self

David Boreanaz

Self

Kevin McNally

Self

Harvey Weinstein

Self

Hillary Clinton

Self

Hugh Grant

Self

Henry Winkler

Self - Audience Member (uncredited)

Shaquille O'Neal

Self

Ray Romano

Self - Interviewee / Audience Member

Kyle Gass

Self

Robin Williams

Ivan 'Bob' Poppanoff the 'Russian Idol'

Sharon Osbourne

Self - Interviewee / Audience Member

Keira Knightley

Self

Kiefer Sutherland

Self

Josh Groban

Self

Snoop Dogg

Self

Parminder Nagra

Self

Chris Kattan

Self

Twiggy

Self

Ewan McGregor

Self

Sarah Michelle Gellar

Self

Rob Lowe

Self

Jason Biggs

Self

Forest Whitaker

Self

Phil McGraw

Self

Antonio Banderas

Self

Tom Cruise

Self

Rob Schneider

Self

Goldie Hawn

Self

Lisa Kudrow

Self

Gwyneth Paltrow

Self

Benji Madden

Self

Gillian Anderson

Self

Teri Hatcher

Self

Eric McCormack

Self

Bernadette Peters

Self

Jack Black

Self

Kevin Bacon

Self

Lady Gaga

Self

Emily Blunt

Self

Kenny Loggins

Self - Guest Judge

Kenny Wayne Shepherd

Self - Guest

Amy Adams

Self

Eric Anthony Lopez

Self - Auditionee