The Ellen DeGeneres Show

(3 p.m., NBC10) - Country singer John Rich.

The Big Bang Theory (8 p.m., CBS3) - Amy dumps Sheldon despite not being officially his girlfriend.

So You Think You Can Dance (8 p.m., Fox29) - Mary Murphy is back on the judges panel with Nigel Lythgoe.

The Vampire Diaries (8 p.m., CW57) - Elena discovers the fates of Uncle John and Jeremy.

Rules of Engagement (8:30 p.m., CBS3) - When Russell's mother cuts off his trust fund, he moves in with Timmy.

CSI: Crime Scene Investigation (9 p.m., CBS3) - Justin Bieber makes his acting debut, playing a troubled teen.

Nikita (9 p.m., CW57) - A former spy and assassin seeks retribution against a secret U.S. agency.

The Mentalist (10 p.m., CBS3) - Someone is murdered and someone else goes missing on the estate of a wealthy family.

The Daily Show With Jon Stewart (11 p.m., COM) - Author Jon Ronson.

Conan (11 p.m., TBS) - Dana Carvey; Mike Zohn and Evan Michelson.

The Colbert Report (11:31 p.m., COM) - Filmmaker Alison Klayman.

Late Show With David Letterman (11:35 p.m., CBS3) - Ray Romano; Arctic Monkeys.

The Tonight Show With Jay Leno (11:35 p.m., NBC10) - Piers Morgan; Scott Weiland performs.

Jimmy Kimmel Live (Midnight, 6ABC) - Christina Aguilera; Mike Tyson; Big Sean.

Lopez Tonight (Midnight, TBS) - Comedian Russell Peters; singer Ja Rule.

The Late Late Show With Craig Ferguson (12:37 a.m., CBS3) - Seth Green; magician Lance Burton.

Late Night With Jimmy Fallon (12:37 a.m., NBC10) - James McAvoy; Gilbert Gottfried; Amos Lee.