The Biggest Loser, Rudy

NBC Photo: Trae Patton

The Biggest Loser, one of NBC's most successful reality shows, has been renewed for the 2011-2012 season. Not the biggest of surprises.

So it makes sense, really, that the onetime "Must See TV" network is also looking to keep eyeballs on the screen with another season of its successful singing competiton and a more recent addition to the prime-time lineup that has celebs signing up by the handful...

NBC announced Tuesday that, along with The Biggest Loser, it has ordered up additional seasons of The Sing-Off, again to be hosted by Nick Lachey, and the family-tree-focused Who Do You Think You Are?, which is currently enjoying its second season and is going to be unlocking a few secrets from Kim Cattrall's grandfather's past on Friday.

"They are each unique, attention-getting shows with terrific producing and talent-auspices, and we're proud to be associated with them," NBC Entertainment Chairman Bob Greenblatt said in heralding the programming moves.

Still coming up this season on Who Do You Think You Are? are Gwyneth Paltrow, Steve Buscemi, Ashley Judd and Lionel Richie.

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