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Jillian Michaels

Courtesy of Don Flood

Believe it or not, there is one part of Jillian Michael's perfectly toned body that she actually has a problem with.

"I've never fully loved my booty," the Biggest Loser star admitted on today's episode of The Wendy Williams Show. "It fits in the clothes nicely. In clothes, I can stuff that sucker into a pair of jeans and you would never know. But out of the jeans it just kinda...falls."

"Is it dimply?" Wendy Williams asked, to which Michaels replied, "Yes, it is."

Michaels, who turns 40 next month, also opened up about her upcoming milestone birthday.

"It's such a powerful number," she said. "Cause I'm going, ‘I'm middle aged! I'm middle aged!' I'm really trying to like breathe and embrace it. And it's kind of shocking, cause I don't think of myself as middle aged."

As for her butt, Michaels says she been working with a trainer and doing lots of lunges to get it in tip-top shape.

"My goal for 40 is to not get up and walk away backwards," she laughed. "And [my partner] Heidi has told me, ‘I've seen your butt.' I'm like, ‘No, not really. Not in the bright light.'"