Fans weren't the only ones shocked by The Biggest Loser winner Rachel Frederickson's weight loss. Jillian Michaels herself was at a loss for words.

The personal trainer appeared flabbergasted by Frederickson's 155-pound weight loss (from 260 to 105) on the show's season 15 finale on Tuesday. When the 24-year-old former high school swimmer walked out onstage for the first time since leaving the ranch last fall ... this was Jill's reaction:

The Biggest Loser isn't simply returning with new episodes in January. It's bringing back an former favorite and focusing on an issue that plagues the nation.

That's right, Jillian Michaels - who exited the NBC competition in 2011 in order to focus on her new family - will once again be the head trainer next year, but this time she will be barking orders at a cast of 13-17-year olds, as The Biggest Loser tackles the issue of childhood obesity.

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Jillian Michaels is going from The Biggest Loser to the biggest step a person can take: motherhood. She hopes, at least.

"Season 11 of Biggest Loser will be my last :) have to finish out my contract," Michaels Tweeted this week. "I want to take a year off TV and focus on becoming a mommy and doing more charity work."

Posted in: Jillian Michaels

Jillian Michaels Biography

Jillian Michaels Redbook Cover
Jillian Michaels is a personal trainer. She's risen to fame due to her role on NBC's The Biggest Loser. Michaels was born in Los Angeles... More »
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Jillian Michaels