Jillian Michaels is really serious about losing weight — even if that means ditching her clothes.

Shape
The fitness guru, 40, bares every inch of her toned body for a very risqué photo shoot in the July/August issue of Shape.

The television personality says that despite having reached middle age, her body is as fit as it’s ever been.

“When I think back on my 20s and 30s, I look better now than I ever have. Yes, I’m older but I’m also wiser and that’s a more intrinsic type of beauty,” she told the magazine.

What may come as a surprise to viewers used to Michaels’ explosive personality on “The Biggest Loser” is her idea that it’s more important that people be happy with how they look than that they be as in shape as possible.

“Do I want to have a better butt?” she said “Sure, but I’m healthy and can wear my skinny jeans, and that’s good enough!”