Howie Mandel on "Howie Do It" NBC Goes All Out This Spring with Live Season Finales of 'The Biggest Loser: Couples' and 'The Celebrity Apprentice,' The 100th Episode of 'The Office,' and a Special Finale of '30 Rock' — Guest Stars on NBC this spring include Alan Alda, Sheryl Crow, Mary J. Blige, Elvis Costello, Clay Aiken, Salma Hayek, Hilary Duff, Macaulay Culkin, Leslie Bibb, Amy Ryan, Scott Bakula, Chevy Chase, Tracy Pollan, Anjelica Huston, and Rumer Willis Read more...