Ryan Seacrest

Self - Host

Randy Jackson

Self

Simon Cowell

Self

Paula Abdul

Self

Clay Aiken

Self - Performer

David Boreanaz

Self

Flex Alexander

Celebrity Courtyard Correspondent

Anthony Anderson

Self

Dwayne Johnson

Self

Denzel Washington

Self

Kelly Rowan

Self

Tamyra Gray

Self

Lenny Kravitz

Self

Stephen Collins

Self

Lindsay Lohan

Self

Elisha Cuthbert

Self

Justin Guarini

Celebrity Courtyard Correspondent

Jasmine Trias

Self - American Idol contestant

Michelle Trachtenberg

Self

Steven Cojocaru

Britney Spears

Self - Performer

Tom Arnold

Carmen Electra

Self

John Stevens

Self - American Idol contestant

Antonio Sabàto, Jr.

Self

Catherine Bell

Self

Michael Bublé

Self - Performer

Andrew Lawrence

Celebrity Courtyard Correspondent

Kylie Minogue

Self

Kathie Lee Gifford

Self

Baby Bash

Self - Performer

Hilary Duff

Self

Bryan Cranston

Self

Sasha Alexander

Self

Omarion

Self

Marques Houston

Self

Kimberly Caldwell

Celebrity Courtyard Correspondent

Kristen Stewart

Self

Kathy Najimy

Self

Breckin Meyer

Self

Seal

Self - Performer

Daisy Fuentes

Celebrity Courtyard Correspondent

Kelly Clarkson

Self - Performer

Rob Schneider

Self

LisaRaye McCoy

Self

Jim Verraros

Celebrity Courtyard Correspondent

Arsenio Hall

Self

Keiko Agena

Celebrity Courtyard Correspondent

Jennifer Love Hewitt

Self

Lucy Lawless

Self

Carmen Rasmusen

Celebrity Courtyard Correspondent

Eliza Dushku

Self

Pat Monahan

Self - Train (singer)

Johnny Colt

Self - Train (bass)

Jimmy Stafford

Self - Train (guitar)

Brandon Bush

Self - Train (piano)

Scott Underwood

Self - Train (drums)

JC Chasez

Self - Performer

Sela Ward

Self

Jesse Bradford

Self

Diego Luna

Self

Sharon Osbourne

Self

Samaire Armstrong

Self

Oprah Winfrey

Self

Johnny Depp

Self

Ben Stiller

Self

Jennifer Garner

Self

Jolene Blalock

Self

Taylor Hanson

Self - (Hanson) Performer

Zac Hanson

Self - (Hanson) Performer

Isaac Hanson

Self - (Hanson) Performer

Roma Downey

Self

Sean Patrick Thomas

Self

Trista Sutter

Self - The Bachelorette

Ryan Sutter

Self - The Bachelorette

Jami Gertz

Self

Mark Addy

Self

Chuck Woolery

Self

Esai Morales

Self

Debbie Gibson

Celebrity Courtyard Correspondent

Molly Shannon

Self

Mekhi Phifer

Self

Gisele Bündchen

Self

Caroline Dhavernas

Celebrity Courtyard Correspondent

Michael Chiklis

Self

Ving Rhames

Self

Melana Scantlin

Celebrity Courtyard Correspondent

Jon Foreman

Self - Switchfoot (singer)

Tim Foreman

Self - Switchfoot (bass)

Drew Shirley

Self - Switchfoot (guitar)

Jerome Fontamillas

Self - Switchfoot (guitar)

Chad Butler

Self - Switchfoot (drums)

Rebecca Gayheart

Self

Regis Philbin

Self

Leah LaBelle

Self - American Idol Contestant

Jackie Thomas

Self

Tyra Banks

Self

Murphy Lee

Self - Performer

Jermaine Dupri

Self - Performer

Cindy Herron

Self - (En Vogue) Performer

Terry Ellis

Self - (En Vogue) Performer

Maxine Jones

Self - (En Vogue) Performer

Nelly Furtado

Self

Janice Dickinson

Self

Bonnie Hunt

Self

Sen Dog

Cypress Hill - Performer

B-Real

Cypress Hill - Performer

DJ Muggs

Cypress Hill - Performer

Eric Bobo

Cypress Hill - Performer

Linda Cardellini

Self

David Arquette

Self

Jamie-Lynn Sigler

Self

Ron Perlman

Self

Jerry Springer

Self

Chris Klein

Self

Yoanna House

Self

Adam Gontier

Three Days Grace (performance)

Neil Sanderson

Three Days Grace (performance)

Brad Walst

Three Days Grace (performance)

Barry Stock

Three Days Grace (performance)

Shannen Doherty

Self

Raquel Castro

Self

Natasha Henstridge

Self

Janet Jackson

Self

Tori Amos

Self - Performer

Rachel Hunter

Self

Susie Castillo

Self

Solange

Self

Shad Moss

Self

Dan Cortese

Self

Ashley Scott

Self

Rick Springfield

Self - Performer

Jerry O'Connell

Self

Dolly Parton

Self

Anne Hathaway

Self

Tracy Morgan

Self

Michael Madsen

Self

Melissa Joan Hart

Self

Robert Schwartzman

Rooney (performance)

Louie Stephens

Rooney (performance)

Taylor Locke

Rooney (performance)

Matthew Winter

Rooney (performance)

Ned Brower

Rooney (performance)

Kim Delaney

Self

Cedric the Entertainer

Self

Vanessa Williams

Self

Daryl Hannah

Self

Kevin Bacon

The Bacon Brothers (performance)

Michael Bacon

The Bacon Brothers (performance)

Quentin Tarantino

Self

Lisa Rinna

Self

Kevin Pollak

Self

Jason Priestley

Self

Barry Manilow

Self - Performer

Nia Vardalos

Self

Usher

Self

Gabrielle Union

Self

Smokey Robinson

Self - Performer

Enrique Iglesias

Self - Performer

Reba McEntire

Self

Adam Sandler

Self

Nicole Richie

Self

LeAnn Rimes

Self

John Mayer

Self - Performer

Donald Trump

Self

Missy Elliott

Self

Sting

Self

Kiefer Sutherland

Self

Frankie Muniz

Self

Ruben Studdard

Self - Performer

Jason Bateman

Self

Josh Duhamel

Self

Topher Grace

Self

Sheryl Crow

Self (performance)

Mike O'Malley

Self

Liza Snyder

Self

Jean Louisa Kelly

Self

Jon Cryer

Self

Deidra Roper

Spinderella - Celebrity Courtyard Correspondent

Michelle Branch

Self (performance)

Bobb'e J. Thompson

Self

Jeff Probst

Self

Aisha Tyler

Self

Jack Osbourne

Self

Doris Roberts

Self

Sarah McLachlan

Self (performance)

Bob Guiney

Celebrity Courtyard Correspondent

Joe Rogan

Self

Doug Stanhope

Self

Kimberley Locke

Self (performance)

Greg Kinnear

Self

Dakota Fanning

Self

Beau Bridges

Self

Mischa Barton

Self - The O.C.

Adam Brody

Self - The O.C.

Rachel Bilson

Self - The O.C.

Peter Gallagher

Self - The O.C.

Alan Dale

Self - The O.C.

Melinda Clarke

Self - The O.C.

Navi Rawat

Self - The O.C.

Amanda Righetti

Self - The O.C.

Alicia Keys

Self (performance)

Terry Dubrow

Self

Jeff Gordon

Self