NBC Renews "Biggest Loser," "The Sing-Off"

NBC's "Biggest Loser" will be a winner for the network for at least one more season. On Tuesday, NBC announced that they've decided to renew the popular weight loss competition for the 2011-2012 season. The network also revealed that "The Sing-Off" will be back for another Nick Lachey-hosted season, while "Who Do You Think You Are" will also return for another installment. NBC Entertainment Chairman Bob Greenblatt says their happy to be keeping all three shows. He states, quote, "They are each unique, attention-getting shows with terrific producing and talent-auspices, and we're proud to be associated with them."