Legally Blonde (8 p.m., Fox29) - In this 2001 comedy, Reese Witherspoon plays a sorority girl who is dumped by her blue-blood beau, then follows him to Harvard, intent on winning him back. Instead, she finds a new cause while surprising her professors.

90210 (8 p.m., CW57) - As opening night of Spring Awakening nears, Ty reveals his plans for an intimate after-party to Annie. Brenda, Kelly and Ryan confront Adrianna about her substance abuse.

The Mentalist (9 p.m., CBS3) - When a high school girl's body washes up on the beach, Patrick Jane sets a trap to get a group of surfers to turn on one another and reveal what really happened.

Hitched or Ditched (9 p.m., CW57) - El Lana and Torrino, an interracial couple from North Carolina, are invited to their own wedding after 10 years of dating; it's been rough because they faced resistance to their relationship.

Law & Order: Special Victims Unit (10 p.m., NBC10) - A woman is found in Riverside Park, beaten and raped with no memory of what happened. A suspect is found who has pornographic videos on his computer, and the women in the videos also suffer from memory loss.

Late Show With David Letterman (11:35 p.m., CBS3) - Michael J. Fox; The Fray performs.

The Tonight Show With Conan O'Brien (11:50 p.m., NBC 10) - Gwyneth Paltrow; comic Joel McHale; John Mayer Trio performs.

Jimmy Kimmel Live (12:06 a.m., 6ABC) - Ty Pennington; author David Sedaris; the Jonas Brothers perform.

The Late Late Show With Craig Ferguson (12:37 a.m., CBS3) - Eddie Izzard; Martina McBride performs.