NBC Renews 'The Biggest Loser,' 'Who Do You Think You Are?' and 'The Sing Off'

In a not-so-surprising move, NBC has renewed its three biggest reality/alternative programs: 'The Biggest Loser,' 'Who Do You Think You Are?' and 'The Sing Off' for the 2011-2012 TV season.

"Alternative series such as these three bona fide hits are important not only to their loyal audiences but also as strong components of the NBC schedule," Bob Greenblatt, NBC Entertainment chairman, said in a statement. "They are each unique, attention-getting shows with terrific producing and talent auspices, and we're proud to be associated with them."

'The Biggest Loser' has been on NBC since 2004 in a few different incarnations. From 'Couples' to 'Families,' the series has been a strong performer for the Peacock network. Next season 'Loser' will not feature trainer Jillian Michaels.

'The Sing Off' season 2 enjoyed a strong winter season, grabbing an average of 8.5 million viewers.

Meanwhile, 'Who Do You Think You Are?,' now in its second season, has held strong with 6-7 million viewers. The show follows celebrities as they discover their ancestors through family trees.