Who's On What Tonight? Your Guide to Late-Night TV (Tuesday, September 18, 2012)

CONAN O'BRIEN: Glee's Chris Colfer, Parks and Recreation's Adam Scott, comedian Nikki Glaser
DAVID LETTERMAN: President Barack Obama
JAY LENO: Trouble with the Curve's Justin Timberlake, Los Angeles Laker Steve Nash, musician Ryan Bingham
JIMMY KIMMEL: Arbitrage's Richard Gere, How I Met Your Mother's Josh Radnor
JIMMY FALLON: Two and a Half Men's Jim Cryer, Person of Interest's Taraji P. Henson, singer Nelly Furtado
CRAIG FERGUSON: Community's John Goodman, actor Arjay Smith, singer Melissa Etheridge

Guest lineups are subject to change.

SOURCE: The Late Night TV Page