Tyra Banks, Barry Manilow

Justin Timberlake in Central Park {Season Premiere}

Beyonce in Central Park

Kevin Federline

Brad Garrett/Patrice Oneal

Andre Agassi/Kim Basinger

Jessica Simpson/Ron Livingston/Storm Large

Hugh Laurie/Tommy Lee

Orlando Bloom/Biance Ryan/Chi-Lan Lieu

Zach Braff/Outkast

The Rock/John Mayer

Julia Louis-Dreyfus/Bradley Whitford

Sir Elton John/Rainn Wilson

Dixie Chicks/Diane Lane

Sandra Oh/Josh Blue

Eva Longoria/Simon Baker/Cole & LD Miller

Matthew Perry/Kenny Chesney

Lauren Graham/Letoya/Emmitt Smith

Sting/Robert Downey Jr.

Howie Mandel/Chris Brown

Ashton Kutcher/Ludacris

Sheryl Crow/Christina Applegate *Breast Cancer Awareness*

Ted Danson/Robin Thicke/Jon Heder

Evangeline Lilly/Jesse Metcalfe

John Stamos/Andy Roddick/Prince Lorenzo Borghese

Marcia Cross/Rod Stewart/Mike Holmes

Leah Remini/Barry Watson/Monica

Wanda Sykes/Justin Chambers

Tiger Woods/America Ferrera

Allison Janney/Emeril Lagasse/Chingy

Calista Flockhart/Def Leppard

Bob Newhart, Amber Tamblyn, hypnotist Paul McKenna

Heidi Klum / John Krasinski

Jeff Corwin, Faith Hill

Hugh Jackman / Sarah McLachlan

Kirsten Dunst/Judge Joe Brown

Tina Fey/Katharine Heigl/Corrinne Bailey Rae

Annette Benning/JoJo

Amanda Peet/Rick Smith Jr.

Jon Cryer/Aaron Neville/Sharon Karriem

Patricia Arquette, Criss Angel, "Ghost Hunters" Jason Hawes and Grant Wilson

Roseanne, Carrie Underwood

Salma Hayek, wearer of the world's tallest Mohawk Aaron Studham

Sandra Bullock

Charlie Sheen, Tony Little, Richard Simmons

Russell Crowe, Hilary Duff

Emma Thompson, John Legend, the Flying Ace All Stars

Dustin Hoffman, Diddy, Hugh Hefner, Holly Madison, Kendra Wilkinson

Janet Jackson, Brittany Murphy

Martha Stewart, Shemar Moore, Stuart Whitehurst

Will Ferrell, James Blunt

Robin Williams, John Legend

Felicity Huffman, Bianca Ryan, 8-year-old skateboarding twins Tristan and Nic Puehse

Greg Kinnear, Tori Spelling

Penelope Cruz, Emmitt Smith

Bill Clinton, Jay-Z

Denzel Washington, Nathan Lane

Matt Lauer, Meredith Vieira

Matthew Broderick, Fred Willard, The Legends

Cameron Diaz, Chris Daughtry

Ben Affleck, Lucy Liu, Nathan Godsey

Ashley Judd, Snoop Dogg

Minnie Driver, Bob Proctor, John Assaraf

Masi Oka, Ali Larter, Hayden Panettiere, Sendhil Ramamurthy, Chris Kattan, dance squad "Diamonds N' Ruff"

Taye Diggs, Ciara

Jack Hanna, fitness trainer Bob Harper, Damien Rice

Emilio Estevez, Mike Holmes

Mel Gibson, Jo Frost, Mary J. Blige

William Shatner, Vanessa Marcil

Edward Norton, Anne Hathaway, The Fray

Jessica Biel, Shawn and Marlon Wayans

Dakota Fanning, Adam Beach, Natalie Cole

Kellie Pickler, Al Gore

Courteney Cox, John Mayer

Samuel L. Jackson, Eric Mabius

Matthew Fox, Martina Navratilova

Rob Lowe, Nick Graham

Jerry O'Connell, fitness trainer Bob Harper

Wesley Autrey, Hilary Swank

Patrick Dempsey, Indigo Girls, 11-year-old lizard whisperer Lily Capehart

Nicollette Sheridan, Terri and Bindi Irwin

Jennifer Love Hewitt, restaurateurs the Scotto family

The cast of "Little Miss Sunshine"

Paula Abdul

T.R. Knight, K.T. Tunstall

Meredith Vieira, Omarion, personal trainer Bob Harper

Donald Trump, Milo Ventimiglia

Steve Harvey

Judge Judy Sheindlin

George Lopez

Julie Andrews

Wanda Sykes, Jeff Corwin, Ellen's birthday

David Arquette, Bob Harper, 8-year-old piano prodigy Marc Yu

Barbara Walters, Serena Williams, Gym Class Heroes

Diane Keaton

Jennifer Lopez

David Spade

America Ferrera, Keane, David Frei

Christina Aguilera

Rebecca Romijn, Bob Harper

Gwen Stefani

Queen Latifah, Jennifer Hudson, Nelly Furtado

Peter O'Toole, Dominic Monaghan, Keith Barry

Drew Barrymore, Jason Lewis, Lionel Richie

Forest Whitaker, Billy Blanks Jr.

Ryan Phillippe, Bob Harper, Katharine McPhee

Jimmy Kimmel

John Legend, John Travolta,

Jon Abrahams, Augustana, Sandra Bullock, Kyle Collier, Alana Etheridge, Jacob Hays, Laura Marano, Spencer Martin, Julian McMahon

Gina Glocksen, Corinne Bailey Rae, Leah Remini

Homaru Cantu, Ice Cube, Tim McGraw

Pink, Kurt Russell

Jeff Foxworthy, Patty Griffin, Mark Schulman

Anthony Hopkins, Stevie Nicks

Lauren Graham, Phil Stacey, Chris Richardson, Bon Jovi

Ellen in the Park

Mike Holmes, Antonio Banderas, Curtis Stone

Enrique Iglesias, Valerie Bertinelli

Orlando Bloom, Jason Randal, Joss Stone

Lin Charlie, Chris Daughtry, Charlie Liu, Debra Messing

Maroon 5, Katherine Heigl

Ashley Judd, Travis

Cheryl Hines, Holly Hunter, Jordin Sparks