The Ellen DeGeneres Show

(3 p.m., NBC10) - Anne Hathaway (

Bride Wars

).

Oprah Winfrey (4 p.m., 6ABC) - High-tech undies; flattering clothes for all figures.

Gossip Girl (8 p.m., CW57) - When Serena notices Dan cozying up to the new girl in school, Blair and her minions decide to befriend her and sabotage her budding romance.

Rules of Engagement (8:30 p.m., CBS3) - Russell discovers that having a male assistant can be beneficial - especially if he is as awesomely efficient as Timmy.

One Tree Hill (9 p.m., CW57) - Lucas tries to inspire the Ravens. Haley investigates Dan's disappearance.

Make It or Break It (9 p.m., FAM) - Aspiring gymnast Emily Kmetko (Chelsea Hobbs) receives a scholarship to train at a gymnastics center in Colorado, and now she faces stiff competition.

Make 'em Laugh: The Funny Business of America (10 p.m., WHYY TV12) - A six-part miniseries examines themes in American comedy, such as slapstick, satire, and the edgy work of Mae West and Lenny Bruce.

Late Show With David Letterman (11:35 p.m., CBS3) - Samuel L. Jackson; chef Emeril Lagasse; The BPA performs with Iggy Pop.

The Tonight Show With Conan O'Brien (11:35 p.m., NBC10) - Cameron Diaz; mountain climber Johnny Strange; Pete Yorn performs.

Jimmy Kimmel Live (12:06 a.m., 6ABC) - Thomas Haden Church; Ed Helms; spelling bee champion Kavya Shivashankar; 311 performs.

The Late Late Show With Craig Ferguson (12:37 a.m., CBS3) - Marion Cotillard; columnist Michael Musto.

Late Night With Jimmy Fallon (12:37 a.m., NBC10) - John Leguizamo; Nick Cannon; Sonic Youth performs.