Pink, Patrick Dempsey, Gabrielle Douglas, McKayla Maroney, Kyla Ross

Britney Spears, Simon Cowell

Dave Matthews Band, Allison Janney, Reese Witherspoon

Katy Perry, Little Big Town

Justin Bieber, Phillip Phillips

Bethenny Frankel, Kellie Pickler, the top four from "So You Think You Can Dance"

Clint Eastwood, Pattie Mallette, Carly Rae Jepsen

Michael J. Fox, L.A. Reid, PSY

Amy Poehler, Ricky Gervais

Dennis Quaid, Jenna Dewan-Tatum

Viola Davis, Pamela Anderson

Zooey Deschanel, Maggie Elizabeth Jones, No Doubt

Joseph Gordon-Levitt, Kerry Washington, No Doubt

Jennifer Garner, Dwight David Howard, Green Day

Selena Gomez, Kobe Bryant, the Killers

Liam Neeson, Gilles Marini & Peta Murgatroyd, Cher Lloyd

Matchbox Twenty

Eric Dane, Mike "The Situation" Sorrentino, Paul "Pauly D" DelVecchio, Ronnie Ortiz-Magro, Vinny Guadagnino, OneRepublic

Zac Efron, Rebel Wilson, Ed Sheeran

Winona Ryder, Cheryl Hines

Colin Farrell

Matthew Perry, Justin Bartha

Eric Stonestreet, Rachel Maddow, Joshua Radin

Octavia Spencer

Kate Walsh, Mike Epps, Anthony Robles

Joel McHale

Emma Watson, Kym Douglas, D.L. Hughley, the Wallflowers

Matthew Fox, Ellie Goulding

Nicole Richie, Nina Conti

Jessica Lange, Beth Behrs, Hunter Hayes

Portia De Rossi, Jerry O'Connell, LL Cool J, Victoria Jackson & Ali Guthy

Helen Hunt

Taylor Swift

Halle Berry

Madonna

Steve Harvey, Macklemore & Ryan Lewis

Jane Lynch

Emmitt Smith, Cheryl Burke

Denzel Washington, Jenna Fischer, Luke Bryan

Julie Bowen, Peter Facinelli, Elizabeth Reaser

Model Heidi Klum; actresses Nikki Reed and Mackenzie Foy

Actor Russell Brand; reality star Bethenny Frankel

Actress Miley Cyrus; actors Maggie Grace and Jackson Rathbone

Actors Robert Pattinson and Taylor Lautner; actress Kirstie Alley

Adam Levine, Jennifer Hudson, Maroon 5

Actor Andrew Garfield; reality-TV stars Alison Eastwood and Donald Schultz; Ne-Yo performs.

Singer Rihanna; Blue Man Group performs.

Actress Keira Knightley; One Direction performs at an outdoor concert.

Actress Vanessa Williams; Jason Aldean performs.

Alyson Hannigan

Actor Jesse Tyler Ferguson; an interview and performance by Kelly Clarkson

Actress Jennifer Lawrence.

Actor Ray Romano; dancer Stephen ''tWitch'' Boss; Cirque du Soleil's Kiriki act perform.

Ellen Pompeo, Jason Sudeikis, Miguel

Khloe Kardashian, Damian Lewis, Jane Lynch

Tim Allen, Kunal Nayyar, Maroon 5

Wanda Sykes, Kevin Pollak

Jessica Biel, Damon Wayans Jr.

Gerard Butler, Giada De Laurentiis, Martha Plimpton

John Travolta, Olivia Newton-John, Mario Lopez

Drew Barrymore, Cory Monteith

Christina Aguilera

Fergie, Nathan Lane

Naomi Watts, J.R. Martinez

Howie Mandel, Tom Shadyac, Idina Menzel

Amanda Seyfried, Usher

Hugh Jackman, Justin Bieber

Anne Hathaway, Cee-Lo Green

Bradley Cooper, Bruno Mars

Megan Fox, Eddie Redmayne, Bethenny Frankel

Jamie Foxx, Rosemarie DeWitt, One Direction

Alison Sweeney, Allen Stone

Timothy Olyphant, Sarah Hyland, Justin Flom

Courteney Cox, Kevin Hart

Kaley Cuoco, Padma Lakshmi

Bethenny Frankel, Ricky Gervais, Kevin Nealon

Emma Stone, Common

Jimmy Kimmel

Keith Urban, Savannah Guthrie

Nicki Minaj

Jennifer Lopez, Kyle Chandler, Phillip Phillips

Mark Wahlberg, Josh Hopkins

Chris Kluwe, Macklemore & Ryan Lewis

Chris Colfer, Paul

Michael Chiklis

Simon Baker, NeNe Leakes

Kristen Bell, Cedric the Entertainer

Jude Law, Blind Pilot

Sean Hayes, Jillian Michaels

Sally Field, Quvenzhane Wallis

Catherine Zeta-Jones, Nicholas Hoult

Ryan Seacrest

Chris Tucker, Nolan Gould

Kiefer Sutherland

Naomi Campbell, Tim McGraw

Melissa McCarthy, Jacki Weaver

Emeli Sande

Ewan McGregor, Sophia Grace & Rosie

David Spade, The Lumineers

Michelle Obama, Al Gore, Bruno Mars

Mila Kunis, Tegan and Sara

Sofia Vergara, Josh Groban

Josh Duhamel, Bethenny Frankel, Alicia Keys

Chelsea Handler

Dennis Quaid, Nicole -Snooki- Polizzi, Jenni -JWoww- Farley

Wanda Sykes, Kate Upton, Kym Douglas

Russell Brand, Wolfgang Puck

Kate Walsh, Steve Harvey

Felicity Huffman

Randy Jackson, Cameron Mathison

Colin Farrell, Steve Spangler

Zach Braff, Laurie Holden, Chris Mann

Mark Wahlberg and Sean "Diddy" Combs, Bonnie Raitt

Ellie Kemper, Rico Rodriguez

Salma Hayek, Kellan Lutz

Jessica Simpson, Jimmie Johnson

Howie Mandel, Dave Grohl

Steve Carell, Emily VanCamp

Jessica Alba, Scott Foley

Josh Duhamel, Bethenny, Alicia Keys

Halle Berry

Jennifer Love Hewitt, D.L. Hughley & Cheryl Burke

Joel McHale, Michael Weatherly

Nicolas Cage

John Mayer, Eva Mendes

Bruno Mars, Ted Danson

Matthew Perry, Chris O'Dowd

Kellie Pickler, Giuliana and Bill Rancic

Chris O'Donnell, Aubrey Plaza

Jerry O'Connell, Brad Paisley

Mario Lopez, Kacey Musgraves, Bethenny Frankel

Julia Louis-Dreyfus, The Band Perry

Heidi Klum, Michael Weatherly

Hilary Duff, D.L. Hughley and Cheryl Burke

Selena Gomez, Sophia Grace & Rosie

The Cast of 'Grown Ups 2'!

Jennifer Aniston, Bryce Dallas Howard, Brittany Snow

Jennifer Love Hewitt, Ryan Lochte

Jane Lynch, Kenny Chesney

Diane Keaton, Jon Bon Jovi

Dennis Quaid, Kate McKinnon

An Hour with Justin Timberlake

Gwyneth Paltrow, will.i.am

Vince Vaughn, Sophia Grace & Rosie

LL Cool J

Cher, ‘Long Island Medium’ Theresa Caputo

Alison Sweeney, Michael Buble

Cinco de Mayo Pub Quiz, Ellen Pompeo

Matt Lauer, Sophia Grace & Rosie

Lauren Graham, Lady Antebellum

Harry Connick Jr., Kai Langer

Neil Patrick Harris, Beth Behrs

Mother's Day Show, Shakira, Bethenny Frankel

Kerry Washington, Demi Lovato

Cousins on Call Renovation Revealed!

B Girls and More

Sophia Grace & Rosie, Chris Pine, Robin Thicke

Rob Lowe, Alex O'Loughlin

Ed Helms, and the winner of 'Ellen Here's My Talent'

Sophia Grace & Rosie, Hayden Panettiere

Jennifer Aniston, Portia de Rossi!

Amanda Seyfried, Kevin Nealon

Steve Harvey, Grizzly Bear

Memorial Day with Ellen!

Tyler Perry, Ludacris

Howie Mandel, Usher

Steve Carell, Justin Flom

Wanda Sykes, OneRepublic

Kristen Bell, Joe Manganiello

Amy Adams, Olivia Munn

Owen Wilson, Bridgit Mendler

Will and Jaden Smith!

Sophia Grace & Rosie, Vince Vaughn

Sophia Grace & Rosie, Wendy Williams

Bethenny Frankel, Martin Short

Ellen in Sydney

Ellen in Melbourne

Jennifer Love Hewitt, Ryan Lochte

Miley Cyrus, and 'Twilight'!

Shakira, Bethenny Frankel

Kaley Cuoco, Padma Lakshmi, Keone and Mariel Madrid

Russell Brand, Wolfgang Puck

Jennifer Lopez, Kyle Chandler

Wanda Sykes, Dave Franco

Jessica Simpson, Jimmie Johnson

Clint Eastwood, Carly Rae Jepsen and Justin Bieber's mom, Pattie Mallette

Melissa McCarthy, Jacki Weaver

The Cast of 'Grown Ups 2'!

Emma Stone and Common