The Ellen DeGeneres Show

(3-4 p.m., NBC10) -

American Idol

judge Simon Cowell; Alanis Morissette performs.

Oprah Winfrey

(4-5 p.m., 6ABC) - Guests get youthful makeovers; author Kathy Freston provides her new 21-day plan to look and feel better.

American Idol

(8-9 p.m., Fox29) - The musical fortunes of past

American Idol

winners have been all over the map - superstardom for the likes of Carrie Underwood and Kelly Clarkson, subpar success for Ruben Studdard and Taylor Hicks. So, it's anyone's guess how this year's winner - to be announced tomorrow after the final two perform tonight and the fans vote - will fare post-

Idol

. One thing's for sure, though: Getting there is always fun.

Dancing With the Stars

(9-11 p.m., 6ABC) - Whose footwork is fanciest? Whose moves are smoothest? That is up to the viewers and the judges to decide, and their chosen couple is crowned on tonight's results show. Expect some eye-popping dance maneuvers, as the result of all that training pays off for the winners in the season finale.

Late Show With David Letterman

(11:35 p.m.-12:35 a.m., CBS3) - Actor Harrison Ford; actress Ali Lohan; Leona Lewis performs.

The Tonight Show With Jay Leno

(11:35 p.m.-12:35 a.m., NBC10) - Actor Sylvester Stallone; a couple married for 75 years; Jason Mraz performs.

Jimmy Kimmel Live

(12:05-1:05 a.m., 6ABC) - Actor Matthew Fox; the winner of

Dancing With the Stars

; the Pussycat Dolls perform.performs.

The Late Late Show With Craig Ferguson

(12:35-1:35 a.m., CBS3) - Singer Clay Aiken; actor A.J. Buckley.performs.

Late Night With Conan O'Brien

(12:35-1:35 a.m., NBC10) - Actor Denis Leary; actor Jonathan Rhys Meyers; Mates of State perform.