"America's Got Talent" (8 p.m., WMAQ-Channel 5): Hubby Nick Cannon has been standing up for Mariah Carey in Eminem's war of the words, and now Mariah returns the favor by performing - live -- her new single, "Obsessed," on his show. It's the celebrity equivalent of being romantic.

"So You Think You Can Dance" (8 p.m., WFLD-Channel 32): The first part of the two-night finale, broadcast from Hollywood's Kodak Theater.

"Giuliana & Bill" (8 p.m., Style): First Apprentice Bill Rancic and wife Giuliana, a host on E!, most into their new Chicago home.

"Make My Day" (9:30 p.m., TV Land): Deserving people unwittingly get their best day ever in this new hidden-camera series, which is kind of like a more positive "Punk'd." Tonight: A good guy gets to bowl with "The Sopranos'" Vincent Pastore.