NBC says it has ordered new seasons of its U.S. alternative series "The Biggest Loser," "Who Do You Think You Are?" and "The Sing-Off."
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"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," Greenblatt 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."
