10x27 - Sean 'Diddy' Combs, 'Science Bob' Pflugfelder, Miley Cyrus

February 15, 2012

10x28 - Chris Pine, Khloe Kardashian Odom, Puscifer

February 16, 2012

10x29 - Eric Stonestreet, Kate Upton, Jake Owen

February 21, 2012

10x30 - Jessica Alba, Rep. Barney Frank, Nathan Myhrvold, Tower of Power

February 22, 2012

10x31 - Joel McHale, Justin Theroux, Die Antwoord

February 23, 2012

10x32 - After the Oscars Special

February 26, 2012

Oprah Winfrey; Musical Guest Coldplay

10x33 - Steven Tyler, Harvey Weinstein, Melanie Fiona

February 27, 2012

10x34 - Maria Menounos; Mat Kearney

February 28, 2012

“Dancing with the Stars” contestant Maria Menounos; musical guest Mat Kearney.

10x35 - Ed Helms, Leslie Bibb, Wallpaper

February 29, 2012

10x36 - Joan Rivers, Nicki Minaj

March 1, 2012

10x37 - Dr. Phil McGraw; “The Bachelor” runner-up Lindzi Cox; Keane

March 12, 2012

10x38 - Will Ferrell; actress Ellie Kemper; Allen Stone

March 13, 2012

Actor/comedian Will Ferrell; actress Ellie Kemper; music from Allen Stone.

10x39 - Jonah Hill; Busy Philipps; The Crystal Method feat. Martha Reeves

March 14, 2012

10x40 - Channing Tatum; actor Genesis Rodriguez

March 15, 2012

Actor Channing Tatum; actress Genesis Rodriguez.

10x41 - Jessica Simpson; Gael García Bernal

March 19, 2012

Actress Jessica Simpson; actor Gael García Bernal.

10x42 - Kristen Bell; actor Ice Cube; KISS performs

March 20, 2012

Actress Kristen Bell; actor/musician Ice Cube; musical guests KISS.

10x43 - Don Rickles; Amanda de Cadenet; Dr. Teeth and the Electric Mayhem

March 21, 2012

10x44 - Kristin Chenoweth; racecar driver Jimmie Johnson; Neon Trees

March 22, 2012

10x45 - Zooey Deschanel; actor Steven Seagal; Shinedown

March 26, 2012

Actress Zooey Deschanel; actor Steven Seagal; musical guests Shinedown.

10x46 - Ashton Kutcher and Justin Bieber; All-American Rejects

March 27, 2012

10x47 - Adam Carolla; professional basketball player Kevin Durant; White Rabbits

March 28, 2012

10x48 - Carson Daly; actress Kristen Schaal

March 29, 2012

10x49 - Seann William Scott; actress Christa Miller; Eli Young Band

April 2, 2012

10x50 - Edie Falco; Amy Schumer

April 3, 2012

10x51 - Jason Biggs; Lionel Richie and Billy Currington

April 4, 2012

10x52 - Anthony Davis; actress Lena Headey; NeedToBreathe

April 5, 2012

10x53 - LL Cool J; actor James Van Der Beek; Josh Baze

April 9, 2012

10x54 - David Spade; Slash feat. Myles Kennedy

April 10, 2012

10x55 - Ashley Judd; director Bobcat Goldthwait; The Civil Wars

April 11, 2012

10x56 - Danny McBride; actress Dianna Agron; The Shins

April 12, 2012

10x57 - Zac Efron; actress Krysten Ritter; Noel Gallagher

April 16, 2012

10x58 - Mark Harmon; Dancing With the Stars castoff; Ashanti performs

April 17, 2012

10x59 - Jennifer Love Hewitt; Chef Georgia Pellegrini; Jason Mraz

April 18, 2012

10x60 - Gabourey Sidibe; Morgan Spurlock; Kasabian

April 19, 2012

10x61 - Julia Louis-Dreyfus; Andy Hoang & Erik Salgado; The Hives

April 23, 2012

Actress Julia Louis-Dreyfus; Scrabble champions Andy Hoang & Erik Salgado; musical guests The Hives.

10x62 - John Cusack; Vintage Trouble

April 24, 2012

10x63 - Sharon Osbourne; Max Greenfield; LP

April 25, 2012

10x64 - Emily Blunt; Dave Salmoni; Adam Lambert

April 26, 2012

10x65 - Vanessa Williams; Jonny Lee Miller; Andrew Bird

April 30, 2012

10x66 - David Arquette; Civil Twilight

May 1, 2012

10x67 - William H. Macy; Eva Green; Brad

May 2, 2012

10x68 - Scarlett Johansson; Roger Daltrey

May 3, 2012

10x69 - Kristen Stewart; Chloë Grace Moretz; B.o.B.

May 7, 2012

10x70 - Johnny Depp; Casey Wilson; Silversun Pickups

May 8, 2012

10x71 - Steve Harvey; Dev Patel; Glenn Frey

May 9, 2012

10x72 - Dr. Phil McGraw; Carrie Underwood

May 10, 2012

10x73 - Drew Carey; Rita Wilson

May 16, 2012

10x74 - Matthew Morrison; Beth Stern; Delta Spirit

May 17, 2012

10x75 - Kristin Bell; Dax Shepard; Jason Mantzoukas; The Cult

May 18, 2012

10x76 - Kathy Griffin; Emily Maynard; Gavin DeGraw

May 21, 2012

10x78 - Josh Brolin; Bethenny Frankel; Kimbra

May 23, 2012

10x79 - Charlize Theron; Manny Pacquiao; Graffiti6

May 24, 2012

10x80 - Christina Ricci; Chef Adam Perry; fun.

June 4, 2012

10x81 - Andy Samberg; Edward Sharpe and the Magnetic Zeros

June 5, 2012

Actor/comedian Andy Samberg; National Spelling Bee Champion Snigdha Nandipati; musical guests Edward Sharpe & The Magnetic Zeros.

10x82 - Kim Kardashian, Kourtney Kardashian and Khloe Kardashian Odom; Adam Carolla; K'Naan

June 6, 2012

10x83 - Edward Norton; Leighton Meester; Dead Sara

June 7, 2012

10x84 - Martin Short; Cee Lo Green; Goodie Mob

June 12, 2012

10x85 - Jada Pinkett Smith; Matt Kemp; The Temper Trap

June 14, 2012

10x86 - Sally Field; Kevin Love; Waka Flocka Flame

June 19, 2012

10x87 - Anderson Cooper; Scott Caan; Metric

June 21, 2012

10x88 - Katy Perry; Alex Pettyfer; The Offspring

June 25, 2012

10x89 - Louis C.K.; Zoe Kazan

June 26, 2012

10x90 - Matt LeBlanc; Selma Blair; Linkin Park

June 27, 2012

10x91 - Howie Mandel; Chris Bosh; Linkin Park

June 28, 2012

10x92 - Paul Reubens; Dreama Walker; Marina and the Diamonds

July 9, 2012

10x93 - Gary Oldman; Rob Riggle; The Dirty Heads

July 10, 2012

10x94 - Wanda Sykes; Joel Kinnaman; Serj Tankian

July 11, 2012

10x95 - Billy Crudup; Fred Willard; Grace Potter and the Nocturnals

July 12, 2012

10x96 - Bryan Cranston; Larry King; Zac Brown Band

July 16, 2012

10x97 - Russell Brand; Olivia Munn; Matisyahu

July 17, 2012

10x98 - Kate Beckinsale; Chris Harrison; Rubblebucket

July 18, 2012

10x99 - Charlie Sheen; Nicole 'Snooki' Polizzi; Huey Lewis & Joe Cocker

July 19, 2012

10x100 - Ben Stiller; Emily Maynard; The Head and the Heart

July 23, 2012

10x101 - Jeremy Renner; Aaron Paul; Nas

July 24, 2012

10x102 - Colin Farrell; Rosemarie DeWitt; Trey Songz

July 25, 2012

10x103 - Jessica Biel; Rick Ross

July 26, 2012

10x104 - David Duchovny; Jeff Ross; Alabama Shakes

August 13, 2012

10x105 - Joseph Gordon-Levitt; Rebel Wilson; Good Old War

August 14, 2012

10x106 - Thomas Haden Church; Rick Bayless; JJAMZ

August 15, 2012

10x107 - Jennifer Garner; Paul Scheer; The Fixx

August 16, 2012

10x108 - Tom Arnold; Ashley Greene; The Wood Brothers

August 20, 2012

10x109 - Gordon Ramsay; Jordin Sparks; Andy Grammer

August 21, 2012

10x110 - Robert Pattinson; Rick & Corey Harrison; Poliça

August 22, 2012

10x111 - Kyra Sedgwick; Nick Prueher & Joe Pickett; Josh Doyle

August 23, 2012

10x112 - Jamie Foxx; Cat Deeley; Imagine Dragons

September 4, 2012

10x113 - Bob Newhart; Kevin Hart; Miss Willie Brown

September 5, 2012

10x114 - Matt Stone & Trey Parker; Adam Scott; Everclear

September 6, 2012

10x115 - Lea Michele; Simon Bird; The Avett Brothers

September 10, 2012

10x116 - Dr. Phil McGraw; Dakota Johnson; Rita Ora

September 11, 2012

10x117 - Britney Spears & Simon Cowell; Slightly Stoopid

September 12, 2012

10x118 - Terry Bradshaw; Dave Matthews

September 13, 2012

10x119 - Matthew Perry; Josh Hamilton; Kreayshawn

September 17, 2012

10x120 - Richard Gere; Josh Radnor

September 18, 2012

10x121 - Julie Bowen; Nate Parker; The Afghan Whigs

September 19, 2012

10x122 - Julianna Margulies; Jessie Tyler Ferguson; The Killers

September 24, 2012

10x123 - Melanie Griffith; Kerry Washington; Alanis Morissette

September 25, 2012

10x124 - Keanu Reeves; Ginnifer Goodwin; Green Day

September 26, 2012

10x125 - Selena Gomez; Lenny Venito; Tony Bennett

September 27, 2012

10x126 - Zooey Deschanel; Maggie Grace; Electric Approach

October 1, 2012

10x127 - Ty Burrell; Chris Paul; Psy

October 2, 2012