Season 4 aired between 10 Sep 2007 and 15 Aug 2008, 171 episodes.
Episodes
E01
Frank Caliendo / Sherman Alexie / Clay Walker
10 Sep 2007
E02
Gavin de Becker / Dwight Yoakam
11 Sep 2007
E03
Julie Chen / Dario Franchitti / Matt Baetz
12 Sep 2007
E04
Jason Alexander / Barbara Morgan / Scott Kelly / Wendy Kamenoff
13 Sep 2007
E05
Eric Idle / Les Stroud / Finger Eleven
14 Sep 2007
E06
Alan Alda / Alex O'Loughlin
17 Sep 2007
E07
Jeff Goldblum / Paul Haggis / Mandy Moore
18 Sep 2007
E08
Phil McGraw / Kaley Cuoco / Bob Dubac
19 Sep 2007
E09
James Woods / Ben Lee
20 Sep 2007
E10
Terrence Howard / Jennifer Westfeldt / Zap Mama
21 Sep 2007
E11
50 Cent / Emily Deschanel
24 Sep 2007
E12
D.L. Hughley / Kaitlin Olson / Hannibal Buress
25 Sep 2007
E13
Marg Helgenberger / Seth MacFarlane / The National
26 Sep 2007
E14
Jennifer Love Hewitt / Oliver Hudson / Cary Brothers
27 Sep 2007
E15
Greg Kinnear / Paul Morrissey / Raul Midon
28 Sep 2007
E16
Juliette Lewis / David Boreanaz
01 Oct 2007
E17
Chi McBride / Teri Polo / Steve Bertrand
02 Oct 2007
E18
Kevin Smith / Tasha Smith / J.L. Cauvin
03 Oct 2007
E19
Anjelica Huston / Pat Monahan / Cathy Ladman
04 Oct 2007
E20
Josh Duhamel / Radha Mitchell / Diana Krall
05 Oct 2007
E21
Jimmy Smits / Michelle Monaghan / Shout Out Louds
08 Oct 2007
E22
Tim Daly / Nia Long / Ron Pearson
09 Oct 2007
E23
Fred Willard / Saffron Burrows / Modest Mouse
10 Oct 2007
E24
Tom Arnold / Tori Amos
11 Oct 2007
E25
Kevin Robbins
12 Oct 2007
E26
Michael Caine / Lizzy Cooperman
15 Oct 2007
E27
Vicente Fox / Leslie Bibb / Ron Pearson
16 Oct 2007
E28
Ian McKellen / Jena Malone / Avril Lavigne
17 Oct 2007
E29
John Larroquette / They Might Be Giants
18 Oct 2007
E30
Kenneth Branagh / Todd Sawyer
19 Oct 2007
E31
Kristin Chenoweth / Clive Barker / James Jonah
29 Oct 2007
E32
Steve Carell / Good Charlotte
30 Oct 2007
E33
John Lydon / Steve Jones / Joe Theisman / The Sex Pistols
31 Oct 2007
E34
Anthony Hopkins / Yvonne Strahovski
01 Nov 2007
E35
Seth Green / Dwight Yoakam
02 Nov 2007
E36
Dominic Monaghan / Jason Randal
03 Jan 2008
E37
Leonard Nimoy / Lyle Lovett
04 Jan 2008
E38
RZA / Greg Proops
07 Jan 2008
E39
Marion Cotillard / Kevin Fitzgerald / Rogue Wave
08 Jan 2008
E40
Emile Hirsch / Wolfgang Puck
09 Jan 2008
E41
Val Kilmer / Michael Gates Gill / Ian Hunter
10 Jan 2008
E42
Alec Baldwin / Lena Headey / Spoon
11 Jan 2008
E43
Ben Kingsley / Laura Prepon / Lupe Fiasco
14 Jan 2008
E44
Drew Carey / Seth Gabel / Kate Nash
15 Jan 2008
E45
James McAvoy / Jon Cryer / Blake Lewis
16 Jan 2008
E46
Trace Adkins / Julie Benz
17 Jan 2008
E47
Ted Danson / Ali Wentworth / Dean Edwards
18 Jan 2008
E48
Sylvester Stallone / Steve Wiebe / Ayo
21 Jan 2008
E49
Tony Shalhoub / Becki Newton / Ryan Sickler
22 Jan 2008
E50
Carmen Electra / Justin Bartha / Margaret Cho
23 Jan 2008
E51
Ringo Starr
24 Jan 2008
E52
Diane Lane / James Johan
25 Jan 2008
E53
Denis Leary / Bonnie Somerville / Deana Carter
28 Jan 2008
E54
Raquel Welch / Antonio Gates / Lyle Lovett
29 Jan 2008
E55
Jessica Alba / Adam Arkin / Ryan Sickler
30 Jan 2008
E56
Julia Louis-Dreyfus / Lindsay Sloane / Sebastian Maniscalco
31 Jan 2008
E57
Eva Longoria Parker / Allen Covert / Al Madrigal
01 Feb 2008
E58
Kristen Bell / Wicked Tinkers
04 Feb 2008
E59
Amy Ryan / Terry Crews / Sebastian Maniscalco
05 Feb 2008
E60
Bradley Whitford / Lake Bell / Cynthia Littleton
06 Feb 2008
E61
Jon Favreau / Alicia Coppola / Shelby Lynne
07 Feb 2008
E62
Jessica Alba / Dierks Bentley / Mo'Nique
08 Feb 2008
E63
Julie Chen / Natasha Bedingfield
11 Feb 2008
E64
Susan Sarandon / Bonnie Somerville
12 Feb 2008
E65
Michael Clarke Duncan / Angela Kinsey
13 Feb 2008
E66
Evangeline Lilly / Adam Goldberg / Bebel Gilberto
14 Feb 2008
E67
Jeffrey Tambor / Ivana Miličević / Bobby Miyamoto
15 Feb 2008
E68
Alice Cooper / Angela Kinsey / Wyclef Jean
18 Feb 2008
E69
Andre Benjamin / Craig Bierko / Melinda Hill
19 Feb 2008
E70
Tom Selleck / Dario Franchitti / Ziggy Marley
20 Feb 2008
E71
Don Rickles / Joe Mantegna
21 Feb 2008
E72
Fred Willard / Rachel Bilson
22 Feb 2008
E73
Jennifer Beals / Carrie Ann Inaba / Little Big Town
25 Feb 2008
E74
Regis Philbin / Alice Smith
26 Feb 2008
E75
Eric Bana / Patricia Clarkson / Barry Manilow
27 Feb 2008
E76
Natasha Henstridge / Carl Bernstein / Steve Mazan
28 Feb 2008
E77
Dweezil Zappa / Jason Randal / Coolio
29 Feb 2008
E78
Brooke Shields / Ming Tsai / Michelle Biloon
03 Mar 2008
E79
Christina Ricci / Dee Dee Myers / Collective Soul
04 Mar 2008
E80
Dennis Hopper / Yunjin Kim / Nicole Atkins
05 Mar 2008
E81
Wanda Sykes / Saffron Burrows / Grizzly Bear
06 Mar 2008
E82
Amy Sedaris / Shanna Moakler / Blake Shelton
07 Mar 2008
E83
Ray Romano / Kate Flannery / Jeff Caldwell
17 Mar 2008
E84
Kate Beckinsale / Ken Tucker
18 Mar 2008
E85
Parker Posey / Graham Colton
19 Mar 2008
E86
Laurence Fishburne / Rashida Jones / Joe Devito
24 Mar 2008
E87
Thandie Newton / Dom Irrera / Bell X1
25 Mar 2008
E88
Pamela Anderson / Christian Siriano / Judith Smith-Levin
26 Mar 2008
E89
Aisha Tyler / Richard Branson
31 Mar 2008
E90
Forest Whitaker / Jean-Michel Cousteau / Your Lips Your Lips
01 Apr 2008
E91
Marg Helgenberger / Kylie Minogue
02 Apr 2008
E92
Jennifer Love Hewitt / Jonny Lee Miller
03 Apr 2008
E93
Jena Malone / Mrs. Hughes
04 Apr 2008
E94
Bob Saget / Jennifer Esposito
07 Apr 2008
E95
Anne Heche / Deion Sanders / Clinton Jackson
08 Apr 2008
E96
Roseanne Barr / Kaley Cuoco / Counting Crows
09 Apr 2008
E97
Alyson Hannigan / Todd Allen
10 Apr 2008
E98
Christina Applegate / Brittany Snow / Gene Pompa
11 Apr 2008
E99
John Waters / Daniel Lanois
14 Apr 2008
E100
Julie Andrews / David Krumholtz
15 Apr 2008
E101
Jackie Chan / Cobie Smulders / Bell X1
16 Apr 2008
E102
Alyssa Milano / Henry Winkler / Jason Aldean
17 Apr 2008
E103
Kristen Bell / Oliver Hudson
18 Apr 2008
E104
Ben Stein / Alicia Witt / Andrew Norelli
24 Apr 2008
E105
Jason Segel / Connie Schultz
25 Apr 2008
E106
Ewan McGregor / Morrissey
28 Apr 2008
E107
Kathy Griffin / Scott Kennedy / Morrissey
29 Apr 2008
E108
Jeff Bridges / Sophia Myles / Grand Archives
30 Apr 2008
E109
Helen Hunt / Sarah Chalke / She & Him
01 May 2008
E110
Lake Bell / Kal Penn
02 May 2008
E111
Hugh Laurie / Michael Starr
05 May 2008
E112
John Goodman / Jason Aldean
06 May 2008
E113
Felicity Huffman / Mike Doughty
07 May 2008
E114
Emily Deschanel / Melvin Lardy
08 May 2008
E115
Rachel Griffiths / Christopher Gorham
09 May 2008
E116
John Stamos / Judith Smith-Levin / Jaymay
12 May 2008
E117
John Cusack / Paraminder Nagra
13 May 2008
E118
Tony Danza / Maura Tierney
14 May 2008
E119
David Boreanaz / Carrot Top
15 May 2008
E120
Reba McEntire / Vinnie Jones
16 May 2008
E121
Paulina Porizkova / Matt Costa
20 May 2008
E122
Clay Aiken / Chelsea Handler
21 May 2008
E123
Laura Dern / k.d. lang
22 May 2008
E124
Steven Wright / Carson Kressley
23 May 2008
E125
Julia Louis-Dreyfus
02 Jun 2008
E126
Kristin Davis / Joel McHale / Drake Witham
03 Jun 2008
E127
Jane Kaczmarek / Greg Proops
04 Jun 2008
E128
Jeff Foxworthy / Poppy Montgomery
05 Jun 2008
E129
Chelsea Handler / Emmanuelle Chriqui
06 Jun 2008
E130
Evan Handler / Betty White / MGMT
09 Jun 2008
E131
Rachel Dratch / Carl Reiner / Augustana
10 Jun 2008
E132
Stockard Channing / Bill Engvall
11 Jun 2008
E133
Jenna Fischer / Wolfgang Puck
12 Jun 2008
E134
Elizabeth Perkins / Coolio
13 Jun 2008
E135
Alfred Molina / Salman Rushdie
16 Jun 2008
E136
John Hiatt / Virginia Madsen / Darin Strauss
17 Jun 2008
E137
Don Cheadle / Olivia Thirlby
18 Jun 2008
E138
Lewis Black / Billy Bob Thornton / The Boxmasters
19 Jun 2008
E139
Jeffrey Tambor / The Fratellis
20 Jun 2008
E140
David Hasselhoff / Miriam Shor / Amos Lee
23 Jun 2008
E141
Lawrence Block / Chris O'Donnell / Phantom Planet
24 Jun 2008
E142
Stanley Bing / Sigourney Weaver / Three 6 Mafia
25 Jun 2008
E143
James McAvoy / Bengt Washburn
26 Jun 2008
E144
Holly Hunter
27 Jun 2008
E145
Tricia Helfer / Steven Wright
30 Jun 2008
E146
Tyler Matthew Davis / Richard Lewis / Duffy
01 Jul 2008
E147
Chris Isaak / Debbie Reynolds
14 Jul 2008
E148
Julie Andrews / Raymond Crowe
15 Jul 2008
E149
Ben Kingsley / Popovich Comedy Pet Theater
16 Jul 2008
E150
Ron Perlman / Rita Rudner
17 Jul 2008
E151
Criss Angel / Mary Steenburgen
18 Jul 2008
E152
Jarod Miller / Aisha Tyler / Keaton Simons
21 Jul 2008
E153
Julie Chen / Adam Scott / Ricky Skaggs
22 Jul 2008
E154
Val Kilmer / Les Stroud / Curt Smith
23 Jul 2008
E155
Lance Morrow / Amanda Peet
24 Jul 2008
E156
Xzibit / Griffin House
25 Jul 2008
E157
Eric Idle / Nancy Travis
28 Jul 2008
E158
Belinda Carlisle / Jet Li
29 Jul 2008
E159
Tom Sullivan / Michelle Yeoh / Jakob Dylan
30 Jul 2008
E160
Jean-Michel Cousteau / Will Ferrell
31 Jul 2008
E161
Rainn Wilson / Cory Kahaney / The Hold Steady
01 Aug 2008
E162
Cheryl Hines / Harry Shearer
04 Aug 2008
E163
Regis Philbin / Paula Patton
05 Aug 2008
E164
Eddie Izzard / Julie Chen / Jamie Lidell
06 Aug 2008
E165
Jack Black / Kate Mara / Conor Oberst
07 Aug 2008
E166
Toby Keith
08 Aug 2008
E167
Robert Downey Jr. / Amy Smart
11 Aug 2008
E168
Kate Mara / Kiefer Sutherland
12 Aug 2008
E169
Julie Chen / Craig Robinson
13 Aug 2008
E170
Ben Kingsley / Idina Menzel
14 Aug 2008
E171
Radha Mitchell / Aaron Karo
15 Aug 2008