Jillian Previews Her 'Biggest Loser' Comeback!

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After three seasons on the sidelines, Jillian Michaels is returning to the show that made her a fitness sensation: The Biggest Loser!

"Several things brought me back," Michaels explained today at The Television Critics Association Tour in Pasadena, CA today. "First of all, I missed [Bob Harper] and was excited to meet [Dolvett Quince]. That said, you leave the show, you want to do new things and everyone's like, 'That's great! We support you! Can you go back to The Biggest Loser?' I greatly underestimated how inspired the American public gets by the show."

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Unexpectedly, seeing Madonna on tour led Michaels back to TBL. "Bob and I saw Madonna in concert and she was playing all these new songs, and we were like, 'Can you just play Holiday?' The Biggest Loser is sort of my version of Holiday."

As for how long fans can expect her to stay, Michaels vowed, "I will stay on as long as [they'll] have me."

Check out a sneak peek of tonight's season premiere, airing at 8 p.m. on NBC!