Conan (11 p.m., TBS) - Ryan Gosling; Nicole Scherzinger.
Late Show With David Letterman (11:35 p.m., CBS3) - Dr. Jill Biden; Ted Danson.
The Tonight Show With Jay Leno (11:35 p.m., NBC10) - Simon Cowell; Natasha Leggero; Selena Gomez performs.
Jimmy Kimmel Live (12:30 a.m., 6ABC) - Phil McGraw; Quinton "Rampage" Jackson and Jon "Bones" Jones; Switchfoot performs.
