Here's who's sitting down on the couch on the late night shows tonight.

• Charlie Rose: the Science Series continues with a discussion of human sexuality.
• The Daily Show: Alan Weisman (repeat)
• The Colbert Report: John Mellencamp (repeat)
• The Late Show with David Letterman: Robin Williams, Rich Little, and George Jones (repeat)
• Jay Leno: Steve Carell, Manny Ramirez, and The Backstreet Boys (repeat)
• Jimmy Kimmel Live: TBA (repeat)
• Tavis Smiley: Gov. Wesley Clark and Lyle Lovett (repeat)
• Late Night with Conan O'Brien: Patricia Heaton, Tiki Barber, and The Used (repeat)
• The Late, Late Show With Craig Ferguson: Jeff Goldblum, Paul Haggis, and Mandy Moore (repeat)
• Last Call With Carson Daly: David Duchovny and Tig Notaro (repeat)