S06E01 - Episode 1

S06E18 - Episode 18

S06E84 - Nicollette Sheridan/The All-American Rejects

S06E85 - George Clooney/Kiefer Sutherland/T.I.

S06E90 - Amy Poehler, James Morrison

S06E91 - Joey Fatone, O.A.R.

S06E92 - Ted Danson, Ernie Bjorkman

S06E93 - Kevin Nealon, Chris Harrison

S06E94 - Alyson Hannigan, Brandon Wilson

S06E95 - Heidi Klum, Justin Long, Marco Borges

S06E96 - Josh Brolin, Pink with Butch Walker

S06E97 - Penelope Cruz, Dylan and Cole Sprouse, Q-Tip

S06E99 - Jennifer Aniston, Stevie Wonder

S06E100 - John Mayer, Josh Groban, Lady Antebellum, Chester Pitts, Ephraim Salaam

S06E101 - Amy Brenneman, Jason Mraz and Colbie Caillat

S06E102 - Mel B, Eric Dane, Robin Tunney, Melinda Doolittle

S06E103 - Steve Harvey, Kurt Warner, Dr. Neil Shaw

S06E104 - John Legend, Jerry O'Connell

S06E105 - Simon Baker, Miranda Cosgrove

S06E106 - The Jonas Brothers, Mel B

S06E107 - Naomi Watts, Lily Allen

S06E108 - Jeff Probst, Nick Carter

S06E109 - George Lopez, Bar Refaeli

S06E110 - Meredith Vieira, Olivia Wilde

S06E111 - Richard Simmons, Serena Williams, Raphael Saadiq

S06E112 - Denise Richards, Chyler Leigh, Fabio Viviani

S06E113 - Mario Lopez, the Bird and the Bee

S06E114 - David Arquette, Fall Out Boy

S06E115 - Neil Patrick Harris, Kaley Cuoco

S06E116 - Judge Judy Sheindlin, Bret Michaels, Matt Nathanson

S06E117 - Eric McCormack, Chris Harrison, Anthony LaPaglia, the Fray

S06E118 - "The Bachelor" runner-up Melissa Rycroft, Kym Douglas

S06E119 - Jason Mesnick and Molly Malaney, Steve Spangler

S06E120 - Paris Hilton

S06E121 - Carla Gugino, Sean "Diddy" Combs, Taylor Hicks

S06E122 - Carol Burnett, Taylor Hicks

S06E123 - Felicity Huffman, Rascal Flatts

S06E124 - Dwayne "The Rock" Johnson, Elle Fanning

S06E125 - Portia de Rossi, "American Idol" castoffs Jorge Nunez and Jasmine Murray

S06E126 - Julia Louis-Dreyfus, Andy Samberg

S06E127 - Zach Braff, Jenna Fischer

S06E128 - Anderson Cooper, Katy Perry

S06E129 - Paul Rudd, Gavin Rossdale, 7-year-old golfer Brett Sodetz

S06E130 - Noah Wyle, "American Idol" castoff Alexis Grace

S06E131 - Kara DioGuardi, M.C. Hammer

S06E132 - John Stamos, Emily Blunt

S06E133 - Jennifer Hudson

S06E134 - Reese Witherspoon, Bobby Flay

S06E135 - David Spade, Gilles Marini and Cheryl Burke

S06E136 - Halle Berry, Flo Rida

S06E137 - Christina Applegate, Keith Urban

S06E138 - Howie Mandel, Ben McKenzie

S06E139 - Marilu Henner, Lil' Kim and Derek Hough, Martina McBride

S06E140 - Patricia Arquette, Wayne Hoffman, "Dancing With the Stars" castoff David Alan Grier, Rascal Flatts

S06E141 - Jenny McCarthy, Mary McCormack, Natasha Bedingfield

S06E142 - Zac Efron, Demi Lovato

S06E143 - Jessica Lange, Melissa Rycroft and Tony Dovolani, Ludacris and Jesse McCartney

S06E144 - Drew Barrymore, Barry Watson, the Pussycat Dolls

S06E145 - Leslie Mann, Rashida Jones, Pussycat Dolls

S06E146 - Jimmy Kimmel, Marilyn Milian, Brett Dennen, 7-year-old break-dancer Angelo Baligad

S06E147 - Jennifer Love Hewitt, Chicago

S06E148 - Lindsay Lohan, Alec Greven, Prince

S06E149 - Matthew Perry, Leighton Meester

S06E150 - Kristin Chenoweth, "American Idol" castoffs Anoop Desai and Lil Rounds

S06E151 - Kate Walsh, Dierks Bentley, child solar-system expert Brandt Bickford

S06E152 - Michael Douglas, Faryl Smith

S06E153 - Ryan Reynolds, 7-year-old piano prodigy Emily Bear

S06E154 - Matthew McConaughey

S06E155 - Heidi Klum, Annie Duke, "American Idol" castoff Matt Giraud

S06E156 - Simon Cowell, Zachary Quinto, the Black Eyed Peas

S06E157 - Hugh Jackman, Chris Pine

S06E158 - Vanessa Hudgens, 11-year-old sport stacker Steven Purugganan, Kym Douglas

S06E159 - Ryan Seacrest, Alison Sweeney

S06E160 - Jon Cryer, "American Idol" castoff Allison Iraheta, Alison Sweeney

S06E161 - Matthew Fox, Julianne Moore, Lady GaGa

S06E162 - Jay Leno, Ciara

S06E163 - Anderson Cooper, Kelly Clarkson

S06E164 - Ewan McGregor, the winner of "The Biggest Loser", Pink

S06E165 - Jamie Foxx, Marisa Miller, piano prodigy Umi Garrett

S06E166 - George Lopez, No Doubt

S06E167 - Ben Stiller, David Cook

S06E168 - Kevin Nealon, Tamar Geller, Michael Johns

S06E169 - Queen Latifah, Wayne Dyer, Rob Thomas

S06E170 - Steve Martin

S06E171 - Mandy Moore, Kris Allen

S06E172 - Jessica Biel, Kathy Freston, Kellie Pickler