American Idol, Better Off Ted, and Sofia Vergara on Lopez Tonight

8 p.m., FOX

American Idol

Katy Perry and Avril Lavigne serve as guest judges as auditions continue in Los Angeles.

8:30 p.m., ABC

Better Off Ted

Ted (Jay Harrington) helps his brother (guest star Eddie McClintock) get a job for the company that supplies Veridian Dynamics' lab equipment.

9 p.m., ABC

Lost's Season 5 finale

The sixth and final season premiere is just one week away—re-watch last season's finale to prepare.

10 p.m., A&E;

Paranormal State

The team travels to Georgia to investigate claims of a spirit that's scared a family so much that they sleep together on the living room floor.

11 p.m., TBS

Lopez Tonight

George welcomes Modern Family's Sofia Vergara.

Also on the airwaves...
Scrubs, 8 p.m., ABC
NCIS, 8 p.m., CBS
The Biggest Loser, 8 p.m., NBC
NCIS: Los Angeles, 9 p.m., CBS
Human Target, 9 p.m., FOX
Psychic Kids: Children of the Paranormal, 9 p.m., A&E;
Wild Recon, 9 p.m., ANIMAL
Millionaire Matchmaker, 10 p.m., BRAVO
White Collar, 10 p.m., USA
Paranormal Cops, 10:30 p.m.
NCAA Men's Basketball:Michigan State v. Michigan, Clemson v. Boston College, Miami v. Maryland, Kentucky v. South Carolina, Rutgers v. Marquette
NCAA Women's Basketball: Louisiana Tech v. Nevada
NHL Hockey: Coyotes v. Red Wings
ATP Tennis: Australian Open men's and women's quarterfinals

What are you watching tonight?

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Follow TV.com writer Stefanie Lee on Twitter: @StefAtTVDotCom