 | 18x06 Bill Cosby, a Top Ten List presented by Nicole "Snooki" Polizzi, the Black Keys [add summary] | Jan. 10, 2011 |
 | 18x07 Vince Vaughn, Mike Wolfe & Frank Fritz, Cage the Elephant [add summary] | Jan. 11, 2011 |
 | 18x08 Kevin James, Olivia Munn, Blake Shelton [add summary] | Jan. 12, 2011 |
 | 18x09 Kelsey Grammer, Amar'e Stoudemire, Gregg Allman [add summary] | Jan. 13, 2011 |
 | 18x10 Joan Rivers, Jeff Caldwell, Wintersleep [add summary] | Jan. 14, 2011 |
 | 18x11 Jack Hanna, Steven Tyler [add summary] | Jan. 17, 2011 |
 | 18x12 Betty White, Kim & Kourtney Kardashian, the Script [add summary] | Jan. 18, 2011 |
 | 18x13 Martin Short, Greta Gerwig, Darius Rucker [add summary] | Jan. 19, 2011 |
 | 18x14 Kaley Cuoco, Piers Morgan, Wanda Jackson with Jack White [add summary] | Jan. 20, 2011 |
 | 18x15 Nathan Lane, Mike Palascak, Esperanza Spalding [add summary] | Jan. 21, 2011 |
 | 18x16 Justin Bieber, Pauley Perrette, Best Coast [add summary] | Jan. 31, 2011 |
 | 18x17 Matthew Perry, Chris Elliott, a Top Ten List presented by Mitt Romney, the National [add summary] | Feb. 01, 2011 |
 | 18x18 Kate Walsh, Jim Gaffigan, Boxer Rebellion [add summary] | Feb. 02, 2011 |
 | 18x19 Howard Stern, Naughty By Nature [add summary] | Feb. 03, 2011 |
 | 18x20 Martha Stewart, a Top Ten List presented by Justin Bieber, Robert Plant [add summary] | Feb. 04, 2011 |
 | 18x21 Aaron Rodgers, Martin Lawrence, Steel Magnolia [add summary] | Feb. 07, 2011 |
 | 18x22 Adam Sandler, Chris Colfer, Ty Burrell, Gang of Four [add summary] | Feb. 08, 2011 |
 | 18x23 Anderson Cooper, Elton John & Leon Russell [add summary] | Feb. 09, 2011 |
 | 18x24 Nicole "Snooki" Polizzi, Bryan Ferry [add summary] | Feb. 10, 2011 |
 | 18x25 Ed Helms, Ted Alexandro, the Dears [add summary] | Feb. 11, 2011 |
 | 18x26 Tom Brokaw, a Top Ten List with 10 Sports Illustrated swimsuit models, Theophilus London Tom Brokaw, a Top Ten List presented by 10 "Sports Illustrated" swimsuit models, Theophilus London | Feb. 14, 2011 |
 | 18x27 Forest Whitaker, "Sports Illustrated" swimsuit issue cover model Irina Shayk, a Top Ten List present [add summary] | Feb. 15, 2011 |
 | 18x28 Bill Hader, Amos Lee, grocery bagging champ Krystal Smith [add summary] | Feb. 16, 2011 |
 | 18x29 Paris Hilton, Nathan Fillion, Scissor Sisters [add summary] | Feb. 17, 2011 |
 | 18x30 David Spade, Andy Kindler, Lukas Nelson and Promise of the Real [add summary] | Feb. 18, 2011 |
 | 18x31 Donald Rumsfeld, Cobie Smulders, Adele [add summary] | Feb. 21, 2011 |
 | 18x32 Amy Poehler, Dusty the Cat, Deerhunter [add summary] | Feb. 22, 2011 |
 | 18x33 Rainn Wilson, Henry "Hank" Aaron, the Mountain Goats [add summary] | Feb. 23, 2011 |
 | 18x34 Sen. Rand Paul, Bright Eyes [add summary] | Feb. 24, 2011 |
 | 18x35 Matthew Morrison, Jeff Altman, Jessica Lea Mayfield [add summary] | Feb. 25, 2011 |
 | 18x36 Brian Williams, Trey Parker & Matt Stone, Zac Brown Band [add summary] | Feb. 28, 2011 |
 | 18x37 Amanda Seyfried, B.J. Novak, a performance by the Broadway cast of "Spider-Man: Turn Off the Dark" [add summary] | Mar. 01, 2011 |
 | 18x38 Donald Trump, Vanessa Hudgens, Oh Land [add summary] | Mar. 02, 2011 |
 | 18x39 Robin Williams, Judy Greer [add summary] | Mar. 03, 2011 |
 | 18x40 Howard Stern, Naughty By Nature [add summary] | Mar. 04, 2011 |
 | 18x41 Charles Barkley, Sarah Vowell, Cold War Kids [add summary] | Mar. 14, 2011 |
 | 18x42 Bradley Cooper, Mindy Kaling, Bob Geldof [add summary] | Mar. 15, 2011 |
 | 18x43 Steve Martin, Selena Gomez [add summary] | Mar. 16, 2011 |
 | 18x44 Dana Carvey, Dr. Michio Kaku, British Sea Power [add summary] | Mar. 21, 2011 |
 | 18x45 Katie Couric, The Pains of Being Pure at Heart [add summary] | Mar. 22, 2011 |
 | 18x46 Ben Stiller, Dario Franchitti, the Strokes [add summary] | Mar. 23, 2011 |
 | 18x47 Jack Hanna, Danny McBride [add summary] | Mar. 28, 2011 |
 | 18x48 Snoop Dogg [add summary] | Mar. 29, 2011 |
 | 18x49 Norm MacDonald, C.C. Sabathia, Willie Nelson, Norah Jones, Wynton Marsalis [add summary] | Mar. 30, 2011 |
 | 18x50 Chris Rock, Ellen Page, Funeral Party [add summary] | Mar. 31, 2011 |
 | 18x51 James Franco, Royal Bangs [add summary] | Apr. 01, 2011 |
 | 18x52 TBA [add summary] | Apr. 04, 2011 |
 | 18x53 Jennifer Garner, Jamie Oliver, Robbie Robertson [add summary] | Apr. 05, 2011 |
 | 18x54 Don Rickles, Eva Longoria [add summary] | Apr. 06, 2011 |
 | 18x55 Alec Baldwin, Wiz Khalifa [add summary] | Apr. 11, 2011 |
 | 18x56 Ricky Gervais, Bjorn Lomborg, Foo Fighters [add summary] | Apr. 12, 2011 |
 | 18x57 Courteney Cox, Aziz Ansari, Alison Krauss & Union Station featuring Jerry Douglas [add summary] | Apr. 13, 2011 |
 | 18x58 Seth Meyers, Carmelo Anthony, TV on the Radio [add summary] | Apr. 14, 2011 |
 | 18x59 Tina Fey, Tommy Johnagin, Chris Cornell [add summary] | Apr. 15, 2011 |
 | 18x60 Bill Maher, Cote de Pablo, Lupe Fiasco [add summary] | Apr. 25, 2011 |
 | 18x61 Will Ferrell, the Twilight Singers [add summary] | Apr. 26, 2011 |
 | 18x62 Kate Hudson, Rich Eisen, Emmylou Harris [add summary] | Apr. 27, 2011 |
 | 18x63 Dr. Phil McGraw, Chris Hemsworth, a performance by the Broadway cast of "Catch Me If You Can" [add summary] | Apr. 28, 2011 |
 | 18x64 John Krasinski, Brian Kiley, Steve Earle [add summary] | Apr. 29, 2011 |
 | 18x65 Brian Williams, Rex Ryan [add summary] | May. 02, 2011 |
 | 18x66 Caroline Kennedy, Ty Burrell [add summary] | May. 03, 2011 |
 | 18x67 Betty White, Rick Harrison, Morning Teleportation [add summary] | May. 04, 2011 |
 | 18x68 Jodie Foster, Tom Dreesen, Neon Trees [add summary] | May. 05, 2011 |
 | 18x69 Bill Murray, "The Human Fuse" Brian Miser, Brother [add summary] | May. 06, 2011 |
 | 18x70 Albert Brooks, Kristen Wiig [add summary] | May. 09, 2011 |
 | 18x71 Mark Harmon, Chris Morgan, Hugo [add summary] | May. 10, 2011 |
 | 18x72 Chaz Bono, Ray LaMontagne [add summary] | May. 11, 2011 |
 | 18x73 Jim Parsons, Manchester Orchestra [add summary] | May. 12, 2011 |
 | 18x74 Joan Rivers, Nick Griffin, Okkervil River [add summary] | May. 13, 2011 |
 | 18x75 Julianna Margulies, Andy Cohen, a Top Ten List presented by Christina Aguilera, White Lies [add summary] | May. 16, 2011 |
 | 18x76 Martin Short, Melissa McCarthy, Tinie Tempah [add summary] | May. 17, 2011 |
 | 18x77 Keith Olbermann, Julie Bowen, Ben Harper [add summary] | May. 18, 2011 |
 | 18x78 Kelly Ripa, Jennifer Lawrence, a performance by the Broadway cast of "How to Succeed in Business Wit [add summary] | May. 19, 2011 |
 | 18x79 Tracy Morgan, Jake Johannsen, the Airborne Toxic Event [add summary] | May. 20, 2011 |
 | 18x80 Lady Gaga, Eric Stonestreet, the Vaccines [add summary] | May. 23, 2011 |