Frank Caliendo / Sherman Alexie / Clay Walker (S4E1)
9/10/2007
Gavin de Becker / Dwight Yoakam (S4E2)
9/11/2007
Julie Chen / Dario Franchitti / Matt Baetz (S4E3)
9/12/2007
Jason Alexander / Barbara Morgan / Scott Kelly / Wendy Kamenoff (S4E4)
9/13/2007
Eric Idle / Les Stroud / Finger Eleven (S4E5)
9/14/2007
Alan Alda / Alex O'Loughlin (S4E6)
9/17/2007
Jeff Goldblum / Paul Haggis / Mandy Moore (S4E7)
9/18/2007
Phil McGraw / Kaley Cuoco / Bob Dubac (S4E8)
9/19/2007
James Woods / Ben Lee (S4E9)
9/20/2007
Terrence Howard / Jennifer Westfeldt / Zap Mama (S4E10)
9/21/2007
50 Cent / Emily Deschanel (S4E11)
9/24/2007
D.L. Hughley / Kaitlin Olson / Hannibal Buress (S4E12)
9/25/2007
Marg Helgenberger / Seth MacFarlane / The National (S4E13)
9/26/2007
Jennifer Love Hewitt / Oliver Hudson / Cary Brothers (S4E14)
9/27/2007
Greg Kinnear / Paul Morrissey / Raul Midon (S4E15)
9/28/2007
Juliette Lewis / David Boreanaz (S4E16)
10/1/2007
Chi McBride / Teri Polo / Steve Bertrand (S4E17)
10/2/2007
Kevin Smith / Tasha Smith / J.L. Cauvin (S4E18)
10/3/2007
Anjelica Huston / Pat Monahan / Cathy Ladman (S4E19)
10/4/2007
Josh Duhamel / Radha Mitchell / Diana Krall (S4E20)
10/5/2007
Jimmy Smits / Michelle Monaghan / Shout Out Louds (S4E21)
10/8/2007
Tim Daly / Nia Long / Ron Pearson (S4E22)
10/9/2007
Fred Willard / Saffron Burrows / Modest Mouse (S4E23)
10/10/2007
Tom Arnold / Tori Amos (S4E24)
10/11/2007
Kevin Robbins (S4E25)
10/12/2007
Michael Caine / Lizzy Cooperman (S4E26)
10/15/2007
Vicente Fox / Leslie Bibb / Ron Pearson (S4E27)
10/16/2007
Ian McKellen / Jena Malone / Avril Lavigne (S4E28)
10/17/2007
John Larroquette / They Might Be Giants (S4E29)
10/18/2007
Kenneth Branagh / Todd Sawyer (S4E30)
10/19/2007
Kristin Chenoweth / Clive Barker / James Jonah (S4E31)
10/29/2007
Steve Carell / Good Charlotte (S4E32)
10/30/2007
John Lydon / Steve Jones / Joe Theisman / The Sex Pistols (S4E33)
10/31/2007
Anthony Hopkins / Yvonne Strahovski (S4E34)
11/1/2007
Seth Green / Dwight Yoakam (S4E35)
11/2/2007
Dominic Monaghan / Jason Randal (S4E36)
1/3/2008
Leonard Nimoy / Lyle Lovett (S4E37)
1/4/2008
RZA / Greg Proops (S4E38)
1/7/2008
Marion Cotillard / Kevin Fitzgerald / Rogue Wave (S4E39)
1/8/2008
Emile Hirsch / Wolfgang Puck (S4E40)
1/9/2008
Val Kilmer / Michael Gates Gill / Ian Hunter (S4E41)
1/10/2008
Alec Baldwin / Lena Headey / Spoon (S4E42)
1/11/2008
Ben Kingsley / Laura Prepon / Lupe Fiasco (S4E43)
1/14/2008
Drew Carey / Seth Gabel / Kate Nash (S4E44)
1/15/2008
James McAvoy / Jon Cryer / Blake Lewis (S4E45)
1/16/2008
Trace Adkins / Julie Benz (S4E46)
1/17/2008
Ted Danson / Ali Wentworth / Dean Edwards (S4E47)
1/18/2008
Sylvester Stallone / Steve Wiebe / Ayo (S4E48)
1/21/2008
Tony Shalhoub / Becki Newton / Ryan Sickler (S4E49)
1/22/2008
Carmen Electra / Justin Bartha / Margaret Cho (S4E50)
1/23/2008
Ringo Starr (S4E51)
1/24/2008
Diane Lane / James Johan (S4E52)
1/25/2008
Denis Leary / Bonnie Somerville / Deana Carter (S4E53)
1/28/2008
Raquel Welch / Antonio Gates / Lyle Lovett (S4E54)
1/29/2008
Jessica Alba / Adam Arkin / Ryan Sickler (S4E55)
1/30/2008
Julia Louis-Dreyfus / Lindsay Sloane / Sebastian Maniscalco (S4E56)
1/31/2008
Eva Longoria Parker / Allen Covert / Al Madrigal (S4E57)
2/1/2008
Kristen Bell / Wicked Tinkers (S4E58)
2/4/2008
Amy Ryan / Terry Crews / Sebastian Maniscalco (S4E59)
2/5/2008
Bradley Whitford / Lake Bell / Cynthia Littleton (S4E60)
2/6/2008
Jon Favreau / Alicia Coppola / Shelby Lynne (S4E61)
2/7/2008
Jessica Alba / Dierks Bentley / Mo'Nique (S4E62)
2/8/2008
Julie Chen / Natasha Bedingfield (S4E63)
2/11/2008
Susan Sarandon / Bonnie Somerville (S4E64)
2/12/2008
Michael Clarke Duncan / Angela Kinsey (S4E65)
2/13/2008
Evangeline Lilly / Adam Goldberg / Bebel Gilberto (S4E66)
2/14/2008
Jeffrey Tambor / Ivana Miličević / Bobby Miyamoto (S4E67)
2/15/2008
Alice Cooper / Angela Kinsey / Wyclef Jean (S4E68)
2/18/2008
Andre Benjamin / Craig Bierko / Melinda Hill (S4E69)
2/19/2008
Tom Selleck / Dario Franchitti / Ziggy Marley (S4E70)
2/20/2008
Don Rickles / Joe Mantegna (S4E71)
2/21/2008
Fred Willard / Rachel Bilson (S4E72)
2/22/2008
Jennifer Beals / Carrie Ann Inaba / Little Big Town (S4E73)
2/25/2008
Regis Philbin / Alice Smith (S4E74)
2/26/2008
Eric Bana / Patricia Clarkson / Barry Manilow (S4E75)
2/27/2008
Natasha Henstridge / Carl Bernstein / Steve Mazan (S4E76)
2/28/2008
Dweezil Zappa / Jason Randal / Coolio (S4E77)
2/29/2008
Brooke Shields / Ming Tsai / Michelle Biloon (S4E78)
3/3/2008
Christina Ricci / Dee Dee Myers / Collective Soul (S4E79)
3/4/2008
Dennis Hopper / Yunjin Kim / Nicole Atkins (S4E80)
3/5/2008
Wanda Sykes / Saffron Burrows / Grizzly Bear (S4E81)
3/6/2008
Amy Sedaris / Shanna Moakler / Blake Shelton (S4E82)
3/7/2008
Ray Romano / Kate Flannery / Jeff Caldwell (S4E83)
3/17/2008
Kate Beckinsale / Ken Tucker (S4E84)
3/18/2008
Parker Posey / Graham Colton (S4E85)
3/19/2008
Laurence Fishburne / Rashida Jones / Joe Devito (S4E86)
3/24/2008
Thandie Newton / Dom Irrera / Bell X1 (S4E87)
3/25/2008
Pamela Anderson / Christian Siriano / Judith Smith-Levin (S4E88)
3/26/2008
Aisha Tyler / Richard Branson (S4E89)
3/31/2008
Forest Whitaker / Jean-Michel Cousteau / Your Lips Your Lips (S4E90)
4/1/2008
Marg Helgenberger / Kylie Minogue (S4E91)
4/2/2008
Jennifer Love Hewitt / Jonny Lee Miller (S4E92)
4/3/2008
Jena Malone / Mrs. Hughes (S4E93)
4/4/2008
Bob Saget / Jennifer Esposito (S4E94)
4/7/2008
Anne Heche / Deion Sanders / Clinton Jackson (S4E95)
4/8/2008
Roseanne Barr / Kaley Cuoco / Counting Crows (S4E96)
4/9/2008
Alyson Hannigan / Todd Allen (S4E97)
4/10/2008
Christina Applegate / Brittany Snow / Gene Pompa (S4E98)
4/11/2008
John Waters / Daniel Lanois (S4E99)
4/14/2008
Julie Andrews / David Krumholtz (S4E100)
4/15/2008
Jackie Chan / Cobie Smulders / Bell X1 (S4E101)
4/16/2008
Alyssa Milano / Henry Winkler / Jason Aldean (S4E102)
4/17/2008
Kristen Bell / Oliver Hudson (S4E103)
4/18/2008
Ben Stein / Alicia Witt / Andrew Norelli (S4E104)
4/24/2008
Jason Segel / Connie Schultz (S4E105)
4/25/2008
Ewan McGregor / Morrissey (S4E106)
4/28/2008
Kathy Griffin / Scott Kennedy / Morrissey (S4E107)
4/29/2008
Jeff Bridges / Sophia Myles / Grand Archives (S4E108)
4/30/2008
Helen Hunt / Sarah Chalke / She & Him (S4E109)
5/1/2008
Lake Bell / Kal Penn (S4E110)
5/2/2008
Hugh Laurie / Michael Starr (S4E111)
5/5/2008
John Goodman / Jason Aldean (S4E112)
5/6/2008
Felicity Huffman / Mike Doughty (S4E113)
5/7/2008
Emily Deschanel / Melvin Lardy (S4E114)
5/8/2008
Rachel Griffiths / Christopher Gorham (S4E115)
5/9/2008
John Stamos / Judith Smith-Levin / Jaymay (S4E116)
5/12/2008
John Cusack / Paraminder Nagra (S4E117)
5/13/2008
Tony Danza / Maura Tierney (S4E118)
5/14/2008
David Boreanaz / Carrot Top (S4E119)
5/15/2008
Reba McEntire / Vinnie Jones (S4E120)
5/16/2008
Paulina Porizkova / Matt Costa (S4E121)
5/20/2008
Clay Aiken / Chelsea Handler (S4E122)
5/21/2008
Laura Dern / k.d. lang (S4E123)
5/22/2008
Steven Wright / Carson Kressley (S4E124)
5/23/2008
Julia Louis-Dreyfus (S4E125)
6/2/2008
Kristin Davis / Joel McHale / Drake Witham (S4E126)
6/3/2008
Jane Kaczmarek / Greg Proops (S4E127)
6/4/2008
Jeff Foxworthy / Poppy Montgomery (S4E128)
6/5/2008
Chelsea Handler / Emmanuelle Chriqui (S4E129)
6/6/2008
Evan Handler / Betty White / MGMT (S4E130)
6/9/2008
Rachel Dratch / Carl Reiner / Augustana (S4E131)
6/10/2008
Stockard Channing / Bill Engvall (S4E132)
6/11/2008
Jenna Fischer / Wolfgang Puck (S4E133)
6/12/2008
Elizabeth Perkins / Coolio (S4E134)
6/13/2008
Alfred Molina / Salman Rushdie (S4E135)
6/16/2008
John Hiatt / Virginia Madsen / Darin Strauss (S4E136)
6/17/2008
Don Cheadle / Olivia Thirlby (S4E137)
6/18/2008
Lewis Black / Billy Bob Thornton / The Boxmasters (S4E138)
6/19/2008
Jeffrey Tambor / The Fratellis (S4E139)
6/20/2008
David Hasselhoff / Miriam Shor / Amos Lee (S4E140)
6/23/2008
Lawrence Block / Chris O'Donnell / Phantom Planet (S4E141)
6/24/2008
Stanley Bing / Sigourney Weaver / Three 6 Mafia (S4E142)
6/25/2008
James McAvoy / Bengt Washburn (S4E143)
6/26/2008
Holly Hunter (S4E144)
6/27/2008
Tricia Helfer / Steven Wright (S4E145)
6/30/2008
Tyler Matthew Davis / Richard Lewis / Duffy (S4E146)
7/1/2008
Chris Isaak / Debbie Reynolds (S4E147)
7/14/2008
Julie Andrews / Raymond Crowe (S4E148)
7/15/2008
Ben Kingsley / Popovich Comedy Pet Theater (S4E149)
7/16/2008
Ron Perlman / Rita Rudner (S4E150)
7/17/2008
Criss Angel / Mary Steenburgen (S4E151)
7/18/2008
Jarod Miller / Aisha Tyler / Keaton Simons (S4E152)
7/21/2008
Julie Chen / Adam Scott / Ricky Skaggs (S4E153)
7/22/2008
Val Kilmer / Les Stroud / Curt Smith (S4E154)
7/23/2008
Lance Morrow / Amanda Peet (S4E155)
7/24/2008
Xzibit / Griffin House (S4E156)
7/25/2008
Eric Idle / Nancy Travis (S4E157)
7/28/2008
Belinda Carlisle / Jet Li (S4E158)
7/29/2008
Tom Sullivan / Michelle Yeoh / Jakob Dylan (S4E159)
7/30/2008
Jean-Michel Cousteau / Will Ferrell (S4E160)
7/31/2008
Rainn Wilson / Cory Kahaney / The Hold Steady (S4E161)
8/1/2008
Cheryl Hines / Harry Shearer (S4E162)
8/4/2008
Regis Philbin / Paula Patton (S4E163)
8/5/2008
Eddie Izzard / Julie Chen / Jamie Lidell (S4E164)
8/6/2008
Jack Black / Kate Mara / Conor Oberst (S4E165)
8/7/2008
Toby Keith (S4E166)
8/8/2008
Robert Downey Jr. / Amy Smart (S4E167)
8/11/2008
Kate Mara / Kiefer Sutherland (S4E168)
8/12/2008
Julie Chen / Craig Robinson (S4E169)
8/13/2008
Ben Kingsley / Idina Menzel (S4E170)
8/14/2008
Radha Mitchell / Aaron Karo (S4E171)
8/15/2008
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