Brian Williams, Paula Abdul

S18 E01 • Monday, Jan 3, 2011 • Jan 3

Tim McGraw, Shaquille O'Neal, Keri Hilson

S18 E02 • Tuesday, Jan 4, 2011 • Jan 4

Jennifer Connelly, Dr. Oz, Justin Townes Earle

S18 E03 • Wednesday, Jan 5, 2011 • Jan 5

Seth Rogen, Beau Garrett, the Walkmen

S18 E04 • Thursday, Jan 6, 2011 • Jan 6

Regis Philbin, Hannibal Buress, No Age

S18 E05 • Friday, Jan 7, 2011 • Jan 7

Bill Cosby, a Top Ten List presented by Nicole "Snooki" Polizzi, the Black Keys

S18 E06 • Monday, Jan 10, 2011 • Jan 10

Vince Vaughn, Mike Wolfe & Frank Fritz, Cage the Elephant

S18 E07 • Tuesday, Jan 11, 2011 • Jan 11

Kevin James, Olivia Munn, The Low Anthem

S18 E08 • Wednesday, Jan 12, 2011 • Jan 12

Kelsey Grammer, Amar'e Stoudemire, Gregg Allman

S18 E09 • Thursday, Jan 13, 2011 • Jan 13

Joan Rivers, Jeff Caldwell, Wintersleep

S18 E10 • Friday, Jan 14, 2011 • Jan 14

Jack Hanna, Steven Tyler

S18 E11 • Monday, Jan 17, 2011 • Jan 17

Betty White, Kim & Kourtney Kardashian, the Script

S18 E12 • Tuesday, Jan 18, 2011 • Jan 18

Martin Short, Greta Gerwig, Darius Rucker

S18 E13 • Wednesday, Jan 19, 2011 • Jan 19

Kaley Cuoco, Piers Morgan, Wanda Jackson, Miss Arkansas, Alyse Eady

S18 E14 • Thursday, Jan 20, 2011 • Jan 20

Nathan Lane, Mike Palascak, Esperanza Spalding

S18 E15 • Friday, Jan 21, 2011 • Jan 21

Justin Bieber, Pauley Perrette, Best Coast

S18 E16 • Monday, Jan 31, 2011 • Jan 31

Matthew Perry, Chris Elliott, Top Ten with Mitt Romney, the National

S18 E17 • Tuesday, Feb 1, 2011 • Feb 1

Kate Walsh, Jim Gaffigan, Boxer Rebellion

S18 E18 • Wednesday, Feb 2, 2011 • Feb 2

Howard Stern, Naughty By Nature

S18 E19 • Thursday, Feb 3, 2011 • Feb 3

Martha Stewart, Top Ten with Justin Bieber, Robert Plant

S18 E20 • Friday, Feb 4, 2011 • Feb 4

Super Bowl MVP Aaron Rodgers, Martin Lawrence, Steel Magnolia

S18 E21 • Monday, Feb 7, 2011 • Feb 7

Adam Sandler, Chris Colfer, Gang of Four

S18 E22 • Tuesday, Feb 8, 2011 • Feb 8

Anderson Cooper, Elton John

S18 E23 • Wednesday, Feb 9, 2011 • Feb 9

Nicole "Snooki" Polizzi, Judah Friedlander, Bryan Ferry

S18 E24 • Thursday, Feb 10, 2011 • Feb 10

Ed Helms, Ted Alexandro, Steel Magnolia

S18 E25 • Friday, Feb 11, 2011 • Feb 11

S.I. Swimsuit Cover Reveal & Top 10, Tom Brokaw, Theophilus London

S18 E26 • Monday, Feb 14, 2011 • Feb 14

Tom Brokaw, a Top Ten List presented by 10 "Sports Illustrated" swimsuit models, Theophilus London

Forest Whitaker, S.I. Swimsuit Cover Model Irina, Josh Groban, Top Ten with Joy Philbin

S18 E27 • Tuesday, Feb 15, 2011 • Feb 15

Bill Hader, Grocery Bagging Champ Krystal, Amos Lee

S18 E28 • Wednesday, Feb 16, 2011 • Feb 16

Paris Hilton, Nathan Fillion, Scissor Sisters

S18 E29 • Thursday, Feb 17, 2011 • Feb 17

David Spade, Andy Kindler, Lukas Nelson and Promise of the Real

S18 E30 • Friday, Feb 18, 2011 • Feb 18

Donald Rumsfeld, Cobie Smulders

S18 E31 • Monday, Feb 21, 2011 • Feb 21

Amy Poehler, Jean Chu and Dusty the Cat, Deerhunter

S18 E32 • Tuesday, Feb 22, 2011 • Feb 22

Rainn Wilson, Hank Aaron

S18 E33 • Wednesday, Feb 23, 2011 • Feb 23

Senator Rand Paul, Bright Eyes

S18 E34 • Thursday, Feb 24, 2011 • Feb 24

Matthew Morrison, Jeff Altman, Jessica Lea Mayfield

S18 E35 • Friday, Feb 25, 2011 • Feb 25

Brian Williams, Trey Parker & Matt Stone, Zac Brown Band

S18 E36 • Monday, Feb 28, 2011 • Feb 28

Amanda Seyfried, B.J. Novak

S18 E37 • Tuesday, Mar 1, 2011 • Mar 1

Donald Trump, Vanessa Hudgens, Oh Land

S18 E38 • Wednesday, Mar 2, 2011 • Mar 2

Robin Williams, Judy Greer

S18 E39 • Thursday, Mar 3, 2011 • Mar 3

Charles Barkley, Sarah Vowell, Cold War Kids

S18 E40 • Monday, Mar 14, 2011 • Mar 14

Bradley Cooper, Mindy Kaling, Bob Geldof

S18 E41 • Tuesday, Mar 15, 2011 • Mar 15

Steve Martin, Selena Gomez

S18 E42 • Wednesday, Mar 16, 2011 • Mar 16

Dana Carvey, Dr. Michio Kaku, British Sea Power

S18 E43 • Monday, Mar 21, 2011 • Mar 21

Katie Couric, The Pains of Being Pure at Heart

S18 E44 • Tuesday, Mar 22, 2011 • Mar 22

Ben Stiller, Dario Franchitti, The Strokes

S18 E45 • Wednesday, Mar 23, 2011 • Mar 23

"Jungle" Jack Hanna, Danny McBride

S18 E46 • Monday, Mar 28, 2011 • Mar 28

Regis Philbin, Snoop Dogg

S18 E47 • Tuesday, Mar 29, 2011 • Mar 29

Norm Macdonald, CC Sabathia, Willie Nelson, Norah Jones and Wynton Marsalis

S18 E48 • Wednesday, Mar 30, 2011 • Mar 30

Chris Rock, Ellen Page, Funeral Party

S18 E49 • Thursday, Mar 31, 2011 • Mar 31

James Franco, Royal Bangs

S18 E50 • Friday, Apr 1, 2011 • Apr 1