TONIGHT: Lost keeps marching to its finale, the highly anticipated Madonna episode of Glee, and the season finale of 16 and Pregnant make for a very full night of TV.

8:00 PM

American Idol Alicia Keys mentors the kids as they perform inspirational songs. Maybe one or two will be inspired to sing well. (FOX)
The Biggest Loser: Couples Gabrielle Reece trains the contestants on the beach because every time she's on TV sand is involved. Also, someone receives bad news before the weigh-in. (NBC)
Dancing with the Stars The fifth round results are in and Maxwell performs. (ABC)
Your Kid Ate What? Doctors operate on a kid who swallowed a battery. How can you say no to that? (TLC)

9:00 PM

Lost Hurley's crew meets up with the Smoke Monster's gang and things will definitely happen. Probably. (ABC)
Glee OMG, it's the Madonna episode! (FOX)
The Deadliest Catch A storm is approaching in the second week of king crab season. (DSC)
Millionaire Matchmaker Drama is highlighted in the Season 3 reunion show. (BRAVO)

10:00 PM

16 and Pregnant The season finale will undoubtedly be heart-wrenching and cringe-inducing. (MTV)
Justified Raylan investigates the death of a horse breeder and continues to gab about his cowboy hat to no end. We get it, Timothy Olyphant looks good in a cowboy hat. Enough already. (FX)
Parenthood Amber's ex-boyfriend is in town, Adam and Zeek take a road trip and Julia worries her daughter has Asberger's Syndrome clearly forgetting that Parenthood has already filled its Asberger's quota. (NBC)
V Like every other episode, cardboard-like actors run around in front green screens. (ABC)

Who's on the Late Night Couches Tonight?

The Daily Show: John O'Hara (Comedy Central)
The Colbert Report: Jeffrey Katzenberg (Comedy Central)
Jimmy Kimmel Live: Jenna Elfman, the latest "Dancing With The Stars" castoff, Devo (ABC)
Lopez Tonight: Brendan Fraser, Angela Kinsey, Jason Aldean (TBS)
Chelsea Lately Amy & Matt Roloff, Dov Davidoff, Chris Franjola, Natasha Leggero (E!)
The Tonight Show with Jay Leno: Heidi Klum, Ken Jeong, Smashing Pumpkins (NBC)
Late Night with Jimmy Fallon: Rosario Dawson, Tony Siragusa, New Kids on the Block (NBC, repeat)
Last Call with Carson Daly Nick Kroll, Circa Survive (NBC, repeat)
Late Show with David Letterman: Amanda Peet, David Chang, Justin Nozuka (CBS)
Late Late Show with Craig Ferguson: Emily Mortimer, David Simon (CBS)