Credit: John Kringas/Harpo, Inc. Photo: Mariah Carey Reveals Her Post-Baby Bod on The Rosie Show

When Mariah Carey sat down with Rosie O'Donnell on Tuesday night's episode of The Rosie Show, it was hard to believe the Grammy-winning singer had just given birth to twins — who she and husband Nick Cannon affectionately refer to as "Dem Babies" — a little over six months ago.

Clad in a cleavage-baring leather jacket, black mini skirt, and signature stiletto heels, Mariah looked like her old self, the result of an astonishing 70-pound weight loss.

Although MC has established herself as the queen of comebacks, this time around was not so easy. In addition to the stress of carrying twins at the age of 42, Mariah developed gestational diabetes and a severe case of edema, which causes the body to retain large amounts of water and restricts mobility.

"I had a really tough pregnancy," she told Rosie. "Most pregnant woman have that just in their feet. One day I was doing my thank-you notes and I noticed it started rising up the leg … was worried I wasn't going to be able to even walk normally again, because everything was out of alignment."

Luckily, Mariah was back on her feet (and in her Jimmy Choos!) within a week of her C-section. "The first week, I lost 40 pounds of just water," she revealed.

As for the final 30? The result of a strict regimen of Jenny Craig and cardio. But the real key, Mariah cautions, is not becoming too obsessed with the number on the scale.

"I'm going to throw my scale out [after I reach my goal]" she confessed. "I never weigh myself, because for me — people will think I'm a liar, and this is another cliche phrase — but I'm a big-boned girl. I'm a big girl. I'm tall, so I always weighed more."

The songstress, who recently filmed a new video for "All I Want for Christmas Is You" featuring Justin Bieber, plans to return to "Touch My Body" shape, but don't worry if you're lovin' her maternal lady lumps — Mariah promises not to get too thin, because "you don't always lose it where you want to."