Mariah Carey flaunted her incredible post-baby body yesterday proving her weight loss plan is working.

The diva looked younger than her 42-years wearing a black, fitted, long-sleeved shift dress which she teamed with nude killer heels.

Mariah has become the ambassador for the Jenny Craig weight loss programme since giving birth to twins last April. While she may not be able to indulge in sugary treats, Mariah is certainly reaping the benefits as she has managed to bounce back to her previous svelte size, less than a year after giving birth.

Making an appearance on Good Morning America, Mariah opened up about her close friend Whitney Houston's death, saying: "I'm almost incapable of talking about this still. It's very heavy emotionally."

"It was great and I don't think people could ever understand our relationship. There was always this supposed rivalry in the beginning and then we did the duet and we became friends."

Check out the pics of Mariah's new body in the gallery below.

Mariah Carey flaunts incredible post-baby body at 'Good Morning America'...