Just six months after welcoming twins, Mariah Carey shows off her toned tummy on the cover of this week’s issue of Us Weekly.

The 41-year-old singer has lost 30 pounds since joining Jenny (formerly Jenny Craig) in July.

Mariah gave birth to twins Moroccan and Monroe back in April and told the magazine that during her pregnancy, she “gained an enormous amount of weight.”

How’d she slim down?

Beginning in July, Carey buckled down with a nutritionist and a workout plan keeping to a 1,500-calorie-a-day menu and thrice-weekly workouts.

“I feel incredible, I’m proud of how hard I worked to get my body back…I had to do this for me.”

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