Episode 1: Justin Timberlake in Central Park {Season Premiere}

Episode 2: Beyonce in Central Park

Episode 3: Kevin Federline

Episode 4: Brad Garrett/Patrice Oneal

Episode 5: Andre Agassi/Kim Basinger

Episode 6: Jessica Simpson/Ron Livingston/Storm Large

Episode 7: Hugh Laurie/Tommy Lee

Episode 8: Orlando Bloom/Biance Ryan/Chi-Lan Lieu

Episode 9: Zach Braff/Outkast

Episode 10: The Rock/John Mayer

Episode 11: Julia Louis-Dreyfus/Bradley Whitford

Episode 12: Sir Elton John/Rainn Wilson

Episode 13: Dixie Chicks/Diane Lane

Episode 14: Sandra Oh/Josh Blue

Episode 15: Eva Longoria/Simon Baker/Cole & LD Miller

Episode 16: Matthew Perry/Kenny Chesney

Episode 17: Lauren Graham/Letoya/Emmitt Smith

Episode 18: Sting/Robert Downey Jr.

Episode 19: Howie Mandel/Chris Brown

Episode 20: Ashton Kutcher/Ludacris

Episode 21: Sheryl Crow/Christina Applegate *Breast Cancer Awareness*

Episode 22: Ted Danson/Robin Thicke/Jon Heder

Episode 23: Evangeline Lilly/Jesse Metcalfe

Episode 24: John Stamos/Andy Roddick/Prince Lorenzo Borghese

Episode 25: Marcia Cross/Rod Stewart/Mike Holmes

Episode 26: Leah Remini/Barry Watson/Monica

Episode 27: Wanda Sykes/Justin Chambers

Episode 28: Tiger Woods/America Ferrera

Episode 29: Allison Janney/Emeril Lagasse/Chingy

Episode 30: Calista Flockhart/Def Leppard

Episode 31: Bob Newhart, Amber Tamblyn, hypnotist Paul McKenna

Episode 33: Heidi Klum / John Krasinski

Episode 34: Jeff Corwin, Faith Hill

Episode 35: Hugh Jackman / Sarah McLachlan

Episode 36: Kirsten Dunst/Judge Joe Brown

Episode 37: Tina Fey/Katharine Heigl/Corrinne Bailey Rae

Episode 38: Annette Benning/JoJo

Episode 39: Amanda Peet/Rick Smith Jr.

Episode 40: Jon Cryer/Aaron Neville/Sharon Karriem

Episode 41: Tyra Banks, Barry Manilow

Episode 42: Patricia Arquette, Criss Angel, "Ghost Hunters" Jason Hawes and Grant Wilson

Episode 43: Roseanne, Carrie Underwood

Episode 44: Salma Hayek, wearer of the world's tallest Mohawk Aaron Studham

Episode 45: Sandra Bullock

Episode 46: Charlie Sheen, Tony Little, Richard Simmons

Episode 47: Russell Crowe, Hilary Duff

Episode 48: Emma Thompson, John Legend, the Flying Ace All Stars

Episode 49: Dustin Hoffman, Diddy, Hugh Hefner, Holly Madison, Kendra Wilkinson

Episode 50: Janet Jackson, Brittany Murphy

Episode 51: Martha Stewart, Shemar Moore, Stuart Whitehurst

Episode 52: Will Ferrell, James Blunt

Episode 53: Robin Williams, John Legend

Episode 54: Felicity Huffman, Bianca Ryan, 8-year-old skateboarding twins Tristan and Nic Puehse

Episode 55: Greg Kinnear, Tori Spelling

Episode 56: Penelope Cruz, Emmitt Smith

Episode 57: Bill Clinton, Jay-Z

Episode 58: Denzel Washington, Nathan Lane

Episode 60: Matt Lauer, Meredith Vieira

Episode 61: Matthew Broderick, Fred Willard, The Legends

Episode 62: Cameron Diaz, Chris Daughtry

Episode 63: Ben Affleck, Lucy Liu, Nathan Godsey

Episode 64: Ashley Judd, Snoop Dogg

Episode 65: Minnie Driver, Bob Proctor, John Assaraf

Episode 66: Masi Oka, Ali Larter, Hayden Panettiere, Sendhil Ramamurthy, Chris Kattan, dance squad "Diamonds N' Ruff"

Playing

Episode 67: Taye Diggs, Ciara

Episode 68: Jack Hanna, fitness trainer Bob Harper, Damien Rice

Episode 69: Emilio Estevez, Mike Holmes

Episode 70: Mel Gibson, Jo Frost, Mary J. Blige

Episode 71: William Shatner, Vanessa Marcil

Episode 72: Edward Norton, Anne Hathaway, The Fray

Episode 73: Jessica Biel, Shawn and Marlon Wayans

Episode 74: Dakota Fanning, Adam Beach, Natalie Cole

Episode 75: Kellie Pickler, Al Gore

Episode 76: Courteney Cox, John Mayer

Episode 77: Samuel L. Jackson, Eric Mabius

Episode 78: Matthew Fox, Martina Navratilova

Episode 79: Rob Lowe, Nick Graham

Episode 80: Jerry O'Connell, fitness trainer Bob Harper

Episode 81: Wesley Autrey, Hilary Swank

Episode 82: Patrick Dempsey, Indigo Girls, 11-year-old lizard whisperer Lily Capehart

Episode 83: Nicollette Sheridan, Terri and Bindi Irwin

Episode 84: Jennifer Love Hewitt, restaurateurs the Scotto family

Episode 85: The cast of "Little Miss Sunshine"

Episode 86: Paula Abdul

Episode 87: T.R. Knight, K.T. Tunstall

Episode 88: Meredith Vieira, Omarion, personal trainer Bob Harper

Episode 89: Donald Trump, Milo Ventimiglia

Episode 90: Steve Harvey

Episode 91: Judge Judy Sheindlin

Episode 92: George Lopez

Episode 93: Julie Andrews

Episode 94: Wanda Sykes, Jeff Corwin, Ellen's birthday

Episode 95: David Arquette, Bob Harper, 8-year-old piano prodigy Marc Yu

Episode 96: D.L. Hughley

Episode 97: Barbara Walters, Serena Williams, Gym Class Heroes

Episode 98: Diane Keaton

Episode 99: Jennifer Lopez

Episode 100: David Spade

Episode 101: America Ferrera, Keane, David Frei

Episode 102: Christina Aguilera

Episode 103: Rebecca Romijn, Bob Harper

Episode 104: Gwen Stefani

Episode 105: Queen Latifah, Jennifer Hudson, Nelly Furtado

Episode 106: Peter O'Toole, Dominic Monaghan, Keith Barry

Episode 107: Drew Barrymore, Jason Lewis, Lionel Richie

Episode 108: Forest Whitaker, Billy Blanks Jr.

Episode 109: Ryan Phillippe, Bob Harper, Katharine McPhee

Episode 110: Jimmy Kimmel

Episode 111: John Legend, John Travolta,

Episode 112: Jon Abrahams, Augustana, Sandra Bullock, Kyle Collier, Alana Etheridge, Jacob Hays, Laura Marano, Spencer Martin, Julian McMahon

Episode 113: Gina Glocksen, Corinne Bailey Rae, Leah Remini

Episode 114: Homaru Cantu, Ice Cube, Tim McGraw

Episode 115: Pink, Kurt Russell

Episode 116: Jeff Foxworthy, Patty Griffin, Mark Schulman

Episode 125: Anthony Hopkins, Stevie Nicks

Episode 155: Lauren Graham, Phil Stacey, Chris Richardson, Bon Jovi

Episode 159: Ellen in the Park

Episode 161: Mike Holmes, Antonio Banderas, Curtis Stone

Episode 164: Enrique Iglesias, Valerie Bertinelli

Episode 167: Orlando Bloom, Jason Randal, Joss Stone

Episode 168: Lin Charlie, Chris Daughtry, Charlie Liu, Debra Messing

Episode 169: Maroon 5, Katherine Heigl

Episode 170: Ashley Judd, Travis

Episode 171: Cheryl Hines, Holly Hunter, Jordin Sparks