Frazer Harrison, Getty Images

It's only been six months since Mariah Carey gave birth to her twins Moroccan and Monroe, and she looks great on the cover of Us Weekly! She has managed to drop 30 pounds in the past 12 weeks. So, how did she do it?

It turns out she used a workout provided by Jenny (formerly Jenny Craig) and her nutritionalist has her on a 1500 calorie a day diet. She said she had to do this for her, and she did! Congrats Mariah!