Conan

(11 p.m., TBS) Actress Sofia Vergara; actor Paul F. Tompkins.

Late Show With David Letterman (11:35 p.m., CBS3) Actor Matt Damon.

The Tonight Show With Jay Leno (11:35 p.m., NBC10) Katherine Heigl; J.B. Smoove; Taio Cruz performs.

Jimmy Kimmel Live(12:35 a.m., 6ABC) Actor Armie Hammer; actress Jeri Ryan; T-Pain performs.