All that Jenny Craig has paid off for Mariah Carey and shes showing if off on the May cover of Shape magazine, looking like a new woman. Mariah dropped thirty pounds in three months. A year after giving birth, she says losing weight wasnt as easy as it once was. I used to be able to slim down just by exercising more, but thats changed. Since having the babies, I realize that 90 percent of losing weight is my diet.