Mariah Carey
The singer, producer and former judge on "American Idol" famously dropped about 70 pounds of her post-pregnancy weight on the Jenny Craig program. "I used to be able to slim down just by exercising more, but that’s changed. Since having [her twins], I realize that 90 percent of losing weight is my diet,” she told Shape a couple of years ago. The Long Island native, 43, is also a philanthropist and one of the top-selling female artists of all time. “I’m proud of how hard I worked to get my body back," she told Us Magazine. "I had to do this for me.”
