Diddy doing 'Letterman,' Katherine Heigl on 'Kimmel'

Diddy Good evening of talk: Diddy, Zach Galifianakis, Cheryl Hines, Kevin Nealon, Kristin Cavallari and hmmm, wonder what K Heigl will have to say tonight...







"Late Show with David Letterman": Diddy, Vera Farmiga, Ginuwine with Missy Elliott

"The Tonight Show with Conan O'Brien": Zach Galifianakis, Keke Palmer, Jason Aldean

"Late Late Show with Craig Ferguson": Cheryl Hines, Ben Mezrich

"Late Night with Jimmy Fallon": Kevin Nealon, Demi Lovato, Twisted Sister

"Last Call with Carson Daly": Dr. Drew Pinsky, Yvonne Strahovski, Nico Stai (repeat)

"Daily Show with Jon Stewart": Sally Jenkins

"The Colbert Report": Zev Chafets

"Jimmy Kimmel Live": Katherine Heigl, David and Shaun Cassidy, La Roux

"The View": Demi Lovato, Miss USA 2009 Kristen Dalton

"Live with Regis and Kelly": Kevin Nealon, Flo Rida

"The Ellen DeGeneres Show": Ben Stiller, David Cook, six dancers from "So You Think You Can Dance" (repeat)

"Tavis Smiley": Christopher Guest, Harry Shearer, Michael McKean (repeat)

"Chelsea Lately": Kristin Cavallari, Josh Wolf, Jen Kirkman, Ross Matthews

"The Hour with George Stroumboulopoulos": Shai Agassi, Joshua Jackson, Chris Noth (repeat)

"The Bonnie Hunt Show": James Denton, Kate Gosselin, Eric Hutchinson, Bryan Dattilo (repeat)

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