Back in April she gave birth to her twins Moroccan and Monroe, and now Mariah Carey is in fabulous shape after dropping more than 30 pounds.

As for how she did it, the “Always Be My Baby” songstress used the Jenny Craig weight lost system to shed some weight and get healthy.

In fact, Mariah’s weight loss was so successful that she agreed to become a new brand ambassador for the newly-renamed Jenny company.

Featured in a new ad available for viewing in the player found above, Carey shared, 'I'm proud of how hard I worked to get my body back. I had to do this for me. As an artist, I use my voice to entertain. But, today I want to use my voice to draw attention to a serious matter. Two-thirds of the country is placing themselves at risk for heart disease and diabetes. Largely, that is due to unhealthy eating patterns and lack of physical activity.”

“I obtained a greater understanding of this when I was pregnant with my twins and dealing with my own health issues. That's why I feel so strongly about working with Jenny and the American Heart Association to help Americans get serious about their health as it pertains to these issues which are so important.”