Sharon Osbourne, "Are You Smarter Than a 5th Grader?" kids, Jill Scott

Episode 1

Faith Hill, Robin Roberts in New York City

Eric Dane, Paula Deen, beatboxer Butterscotch

George Lopez, Jeff Corwin, Jeff Lewis and Jenni Pulos of "Flipping Out"

Daniel Radcliffe, Harvey Levin, Sabra Johnson

Kathy Griffin, 5-year-old golfer Kyle Lograsso

Magician Hans Klok and Pamela Anderson

Neil Patrick Harris, Rihanna

Kanye West, Mariska Hargitay

Wentworth Miller, Terry Fator

Howie Mandel, Tori Spelling, Dean McDermott, Rascal Flatts

Brad Garrett, Sophia Wise, Mike Klinge, Amy Schumer

Jessica Alba, Gary Vaynerchuk

Masi Oka, Steve Spangler, KT Tunstall

David Spade, Jane Seymour, Tony Dovolani, 90-year-old newlyweds August and Roberta Mahan Offer

Taye Diggs, Bryan Gaynor, James Blunt

Greg Kinnear, Paul Potts, Kat Von D

T.R. Knight, human jumper Chris Bryant

Ben Stiller, Will.i.am, hip hop violinist Paul Dateh

Queen Latifah, 7-year-old race car driver Hunter Stewart

Denis Leary, Dylan and Cole Sprouse, Kenna, Chris Bryant

Jamie Foxx, 6-year-old piano prodigy Emily Bear

Tom Selleck, Nathan Fillion, high school band leader Darrell Watson

Mel B, Maksim Chmerkovskiy, Shawn Johnson, Matchbox Twenty

Kate Walsh, Jack McBrayer, Pat Monahan

Kate Hudson, Rita Wilson, Kristin Chenoweth

Dana Carvey, Miley Cyrus, Billy Ray Cyrus

Jerry O'Connell, Malin Akerman, Gretchen Wilson

Ellen’s house, Chef Gordon Ramsay, Jennifer Connelly

Drew Carey, Angie Stone, "Jon & Kate Plus 8"'s Gosselin Family

Janet Jackson, Nicolai Calabria, Ballou High School Marching Band, Laura Bush

Jake Gyllenhaal, Marc Cohn

Reese Witherspoon

Sir Anthony Hopkins, Nicole Scherzinger, "Price Is Right" contestant Marie Fodale

Steve Carell, pilot Bob Robertson, Kid Rock

Halle Berry, the Jonas Brothers, Greg Grunberg

Barack Obama, Sabrina Bryan, Mark Ballas

Larry Himmel, Amy Brenneman

Jennifer Love Hewitt, bat expert Rob Mies, Hans Klok

Tornado survivors, Victoria Beckham, Steve Spangler

Kid inventors, Josh Duhamel

5-year-old Graham Berger Sacks, Russell Crowe, Carrie Underwood

Jenny McCarthy, Keith Urban

Kid inventors, Hayden Panettiere, Lyle Lovett and His Large Band

Vince Vaughn

James Denton, Jennie Garth, Derek Hough, Chris Brown

Heidi Klum, Sean Casey, singing Taco Bell employee Donnie Lamar Harden

Celine Dion, Will.i.am

Maroon 5

Dwayne "The Rock" Johnson, James Taylor

Christina Applegate, Bobb'e J. Thompson, Backstreet Boys, 700th Show

Jeff Corwin, Soulja Boy Tell 'Em

Mariah Carey, Duran Duran

Helio Castroneves, Julianne Hough, piano prodigy Emily Bear

Tom Brokaw, Joey Fatone, Logan Smalley, Darius Weems

Anderson Cooper, Howie Mandel, Derek Martinez, Deanna Pappas

Paris Hilton, Derek Martinez

Rocco DiSpirito, Jordin Sparks

Jack Black, Josh Brolin, Ingrid Marie Rivera, Keith Urban, Brad Womack

OneRepublic, Dakota Blue Richards, Vanessa Williams

Bryan Dattilo, Snoop Dogg, David Frei

Jenna Bush, Ryan Shaw

Toby Keith, Keira Knightley

Paula Deen, Anthony Gargiula, Trisha Yearwood

Bonnie Brown, Chace Crawford, Allison Janney

Padma Lakshmi, Blake Lewis

Vince Mira, Alison Sweeney

Tippi Hedren, Alec Mapa

David Gray, Ty Pennington

Chris Bryant, Jeff Lewis, Jane Seymour

Colbie Caillat, Carmen Electra, Neil Tejwani

Ricki Lake, Charice Pempengco, Wolfgang Puck, Andrew Zuckerman

Jason Randal, Ashley Tisdale

Bill Germanakos, Maria Sharapova

Scott Baio, Kym Douglas, Marc Yu

Emily Bear, Tim Gunn, Ellen Page

John Legend, Nic Puehse, Tristan Puehse, Ivana Trump, Janice Wolf

Mary J. Blige, Anthony Gargiula

Cody McCasland

Maria Bartiromo, Plain White T's

Jimmy Kimmel, Holly Kiser, Michael McDowell

David Beckham, Ashlee Simpson