Season 20

Guest Stars:

Terrence Howard, Michael Douglas, Roger Federer

Guest Stars:

Jodie Foster, Lyle Lovett

Guest Stars:

Billy Bob Thornton

Guest Stars:

Chris Daughtry, Patricia Heaton

Guest Stars:

Diana Krall, Morgan Freeman, Ashanti

Guest Stars:

KT Tunstall, Brad Garrett, Kelsey Grammer

Guest Stars:

Jessica Alba

Guest Stars:

Courtney Thorne-Smith

Guest Stars:

Hayden Panettiere

Guest Stars:

Peter Krause, Jamie Foxx

Guest Stars:

Queen Latifah

Guest Stars:

Tony Bennett, Jennifer Garner

Guest Stars:

Adrien Brody, Christopher Meloni

Guest Stars:

Jerry O'Connell, Alyssa Milano

Guest Stars:

Ted Danson, Ted Koppel

Guest Stars:

Jude Law, Tina Fey

Guest Stars:

Kyra Sedgwick

Guest Stars:

Cate Blanchett

Guest Stars:

Vanessa Carlton, Faith Ford, Mark Wahlberg

Guest Stars:

Tyler Perry, Joaquin Phoenix

Guest Stars:

Janet Jackson, Eva Mendes, Jeff Probst

Guest Stars:

Christina Applegate, Jessica Seinfeld

Guest Stars:

Jake Gyllenhaal

Guest Stars:

Casey Affleck, Anthony Hopkins

Guest Stars:

Rebecca Romijn, LeAnn Rimes, Ben Affleck

Guest Stars:

Denzel Washington

Guest Stars:

Ashley French, Vanna White, Adrian Pasdar

Guest Stars:

Halle Berry, Anderson Cooper

Guest Stars:

Blake Lively, Carrie Underwood

Guest Stars:

Ethan Hawke, Bill O'Reilly

Guest Stars:

William Baldwin

Guest Stars:

Phil McGraw

Guest Stars:

Amanda Peet

Guest Stars:

Marisa Tomei, Damien Fahey

Guest Stars:

Nigella Lawson, James Pickens Jr., Taye Diggs

Guest Stars:

Seal, Eric Dane, Tom Brokaw

Guest Stars:

Vince Vaughn, John Stamos

Guest Stars:

Paul Giamatti, Vince Vaughn, Jonathan Rhys Meyers

Guest Stars:

Ingrid Hoffmann, Heidi Klum, David Boreanaz

Guest Stars:

Dustin Hoffman, Emeril Lagasse

Guest Stars:

Benjamin Bratt, Alicia Keys, Gordon Ramsay

Guest Stars:

Richard Gere, David Duchovny, Michael C. Hall, Wolfgang Puck

Guest Stars:

Neil Patrick Harris, Dana Delany

Guest Stars:

Patrick Dempsey

Guest Stars:

Jordin Sparks, Donald Trump

Guest Stars:

Jodie Foster, Josh Duhamel

Guest Stars:

James Blunt, Nicole Kidman

Guest Stars:

Jimmie Johnson, Jessica Alba

Guest Stars:

Nick Jonas, Tim Gunn, Joe Jonas, Kevin Jonas

Guest Stars:

Kellie Pickler, Venus Williams

Guest Stars:

Sean Kingston

Guest Stars:

Masi Oka, Keira Knightley

Guest Stars:

Jennifer Jason Leigh, Laura Linney

Guest Stars:

Megan Mullally, Rob Morrow

Guest Stars:

Blake Lewis, Holly Hunter

Guest Stars:

Josh Groban, Jason Lee

Guest Stars:

Lucas Grabeel, Jon Voight

Guest Stars:

Will Smith, Rick Springfield

Guest Stars:

Hilary Swank

Guest Stars:

Nick Lachey

Guest Stars:

Helen Mirren, Jenna Fischer

Guest Stars:

Tom Hanks

Guest Stars:

Emile Hirsch, John C. Reilly

Guest Stars:

Denzel Washington, Charles Grodin

Guest Stars:

Brad Pitt

Guest Stars:

Brad Paisley

Guest Stars:

Jamie Foxx

Guest Stars:

Queen Latifah, Jake Gyllenhaal

Guest Stars:

Joaquin Phoenix, Jerome Bettis

Guest Stars:

Jill Scott, Cole Sprouse, Dylan Sprouse

Guest Stars:

Ice Cube, Kirk Franklin

Guest Stars:

Howie Mandel, James Marsden, Donald Trump

Guest Stars:

Dylan Walsh, Katie Holmes

Guest Stars:

KT Tunstall, Elliot Page

Guest Stars:

Ted Danson, Catherine Bell

Guest Stars:

Soulja Boy, Queen Latifah, Katherine Heigl

Guest Stars:

Lucy Liu, Natasha Bedingfield

Guest Stars:

Ringo Starr, Michael Kors

Guest Stars:

Bret Michaels

Guest Stars:

Diane Lane

Guest Stars:

Kirsten Haglund, Sara Bareilles

Guest Stars:

Carmen Electra

Guest Stars:

Eva Longoria

Guest Stars:

Jeffrey Tambor, Jeff Probst, Anderson Cooper

Guest Stars:

Martin Lawrence

Guest Stars:

Omarion, Shad Moss, Matthew McConaughey

Guest Stars:

K.D. Lang, Kate Hudson

Guest Stars:

Lenny Kravitz, Vince Vaughn, Brooke Shields

Guest Stars:

Enrique Iglesias, Rachel Bilson

Guest Stars:

Samuel L. Jackson

Guest Stars:

Colin Farrell, Evangeline Lilly

Guest Stars:

Hayden Christensen

Guest Stars:

Ryan Reynolds

Guest Stars:

Lauren Conrad, John Larroquette

Guest Stars:

Matthew Fox, Larry the Cable Guy

Guest Stars:

Dennis Quaid

Guest Stars:

Scarlett Johansson

Guest Stars:

Scott Baio

Guest Stars:

Reese Witherspoon, Simon Cowell

Guest Stars:

Josh Kelley, Drew Carey

Guest Stars:

Courteney Cox, Raven-Symoné

Guest Stars:

Jason Statham, David Hyde Pierce

Guest Stars:

Ivanka Trump, Amy Adams, Michael McDonald

Guest Stars:

Lindsay Price

Guest Stars:

Paul Giamatti, Bryant Gumbel, Julianna Margulies

Guest Stars:

Heidi Montag, Jim Carrey

Guest Stars:

Skeet Ulrich, Alyssa Milano

Guest Stars:

Parker Posey, Kate Beckinsale

Guest Stars:

Cheryl Hines, Charlize Theron

Guest Stars:

Queen Latifah, Dustin Hoffman

Guest Stars:

Demi Moore, Joy Philbin

Guest Stars:

Megan Mullally, Kate Bosworth, Tom Cavanagh

Guest Stars:

Bernadette Peters

Guest Stars:

Keira Knightley, K.D. Lang, Matthew McConaughey, Martin Lawrence

Guest Stars:

Julie Andrews

Guest Stars:

Jodie Foster, Avril Lavigne

Guest Stars:

George Clooney, Joy Philbin

Guest Stars:

Brittany Snow

Guest Stars:

Leona Lewis

Guest Stars:

Keanu Reeves

Guest Stars:

Josh Radnor

Guest Stars:

Bryant Gumbel, David Boreanaz

Guest Stars:

Jordin Sparks, Milo Ventimiglia

Guest Stars:

Kristen Bell, Heidi Montag

Guest Stars:

Kyle MacLachlan

Guest Stars:

Kelly Preston, Idina Menzel

Guest Stars:

Kate Voegele

Guest Stars:

Yaël Naïm, Mike Myers

Guest Stars:

Neil Diamond, Jack McBrayer, Piers Morgan

Guest Stars:

Angie Stone, JC Chasez, Chris O'Donnell

Guest Stars:

Jodie Foster, Patrick Dempsey, Laurence Fishburne

Guest Stars:

Larry the Cable Guy, Leona Lewis, Mariah Carey

Guest Stars:

Lenny Kravitz, Jim Carrey, Penn Badgley, Hilary Duff

Guest Stars:

Fergie, Heidi Montag, Amy Poehler, Ashton Kutcher

Guest Stars:

Vanessa Hudgens

Guest Stars:

Sigourney Weaver

Guest Stars:

Jason Fricchione, Luke Perry

Guest Stars:

Kevin Nealon

Guest Stars:

Kyra Sedgwick, Bernadette Peters

Guest Stars:

Brendan Fraser

Guest Stars:

Colbie Caillat, Josh Hartnett

Guest Stars:

Selma Blair, Gabrielle Union

Guest Stars:

Colin Firth

Guest Stars:

Heidi Klum, Meryl Streep

Guest Stars:

Maggie Gyllenhaal, Randy Travis

Guest Stars:

Bryant Gumbel, Caroline Rhea, Nick Lachey

Guest Stars:

Will Ferrell

Guest Stars:

Jennifer Hudson, Amanda Peet

Guest Stars:

Aaron Eckhart

Guest Stars:

Amber Tamblyn

Guest Stars:

Rick Springfield, Kelsey Grammer

Guest Stars:

Jimmie Johnson, Joan Allen

Guest Stars:

America Ferrera, George López

Guest Stars:

Luke Wilson

Guest Stars:

Dennis Hopper, Sharon Osbourne

Guest Stars:

Natasha Bedingfield, Jay Manuel

Guest Stars:

Emily Procter, Susan Sarandon

Guest Stars:

Becki Newton, Ben Stiller

Guest Stars:

Will Ferrell, Robert Downey Jr., Katharine McPhee

Guest Stars:

Eric Dane, Neil Patrick Harris, Avril Lavigne, Gwyneth Paltrow

Guest Stars:

Julie Andrews, Christopher Meloni, David Archuleta, Kevin Spacey

Guest Stars:

Sara Bareilles, Eric Mabius, Mike Myers