She's part of why the 'Grey's Anatomy' alum always looks so good.

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Jillian Michaels was a trainer on NBC's hit reality series The Biggest Loser for 12 seasons. She currently hosts the podcast Keeping It Real and is an investor in several health and wellness brands.

Jillian Michaels isn't one to hold back her emotions. (Remember that time she vetoed the keto diet and even feuded with Al Roker over it ?) But, now the celeb trainer is singing a more loving tune ...