Mariah Carey Weight Loss: Sheds 70 Pounds [PHOTOS & VIDEO]

Mariah Carey showed off her dramatic weight loss on Rosie O'Donnell's show, shedding over 70 pounds from her post-baby body.

After a series of sultry, anonymous campaign ads featuring a mysterious "Madame X" have gone viral on the Internet amassing over one million hits, we now know the svelte starlet featured is recent mother, Mariah Carey.

Carey, 41, is the third star, joining Carrie Fisher, to shed massive pounds this year from Jenny Craig, and she's not afraid to show it off. She appeared on Nov. 8 episode of "The Rosie Show" to debut her astonishing weight loss.

"She's a while lot thinner," O'Donnell said as she introduced Carey from behind a curtain. "She's never looked better."

That's when Carey was lowered onto the stage sitting on a sparkly crescent moon wearing a sexy ensemble.

Carey, who is married to Nick Cannon, is a mother of new twins, Monroe and Moroccan Scott Cannon. She said she lost the weight post-pregnancy from strict diet and some exercise through the Jenny Craig program, for which she is now a spokesperson.

"The first week, I lost 40 lbs... of just water," Carey said, admitting she suffered from edema. "It was just water, initially. When I started with the program, I lost at least 30 lbs. of weight that needed to be lost."

Carey said she not only wanted to lose the weight to regain her appearance, but because everyday tasks like going to the bathroom, were becoming difficult after the edema.

"Edema was the probably the most painful thing I went through during my pregnancy. My legs looked three times the size of what my legs do right now. I thought I would never be the same person again," she said.

According to Carey, she lost most of the weight from dieting, as exercising was too risky after her C-section. "The diet is 90 percent of it," she said.

Carey, who stands at 5'9," said she hasn't weighed herself since losing the weight.

"I never weighed myself," she explains. "People will think I'm a liar but it's true. This is another cliché phrase, I'm a big boned girl ... I'm tall and so I always weigh more."

Instead, she bases her weight loss progress on past outfits, admitting she is currently "between a 4 or 6" in dress sizes.

 "I would tend to go, 'Does this size dress fit me that I wore three years ago? I'm good, let's go.' I would go by what it looked like, how I felt," she admits.

Carey's appearance on "The Rosie Show" was the debut of the singer's body since the birth of her twins and also part of the Jenny Craig campaign, which promised to reveal the identity of the news spokeswoman on Nov. 8, 2011. The appearance also coincided with Rosie O'Donnell's "Ready Set Go" project to help 25 viewers lose weight.

As the new spokesperson for Jenny, the company's new name, Mariah Carey's latest song "Make It Happen" will be a part of the campaign as an inspiration to women.

The song is "so fitting because a lot of people give up hope when they have had their kids and can't lose that 20 pounds or 40 pounds, or they have gone through issues with weight their entire lives. It becomes so frustrating and debilitating that you give up," Carey said.

View the slideshow to see before and after photos of Mariah Carey's weight loss and view the video below to see her new figure as the new spokesperon for Jenny.

Mariah Carey showed off her dramatic weight loss on Rosie O'Donnell's show, shedding off over 70 pounds from her post-baby body.

Mariah Carey showed off her dramatic weight loss as she made her dramatic entrance on Rosie O'Donnell's show, "The Rosie Show."

The fun loving couple go as The Incredibles, even going as far as dressing the babies up!

Mariah Carey

Mariah Carey

Singer Mariah Carey arrives at the 82nd Academy Awards in Hollywood March 7, 2010. REUTERS/Mario Anzuoni

Singer and actress Mariah Carey poses as she arrives for a promotional screening of her new film "Glitter" September 20, 2001 in Los Angeles. This is Carey's first public appearance since suffering a mental breakdown three months ago. The film about an aspiring singer who achieves her dream, opens September 21 in the United States.

Mariah Carey as a fire fighter

U.S. President Barack Obama (3rd R) sings with the first family during the Christmas in Washington Celebration at the National Building Museum in Washington December 12, 2010. (L-R front row) are singer Matthew Morrison, singer Mariah Carey, actress Ellen DeGeneres, first lady Michelle Obama with daughter Sasha, President Obama, daughter Malia and musician Maxwell.

Actress Mariah Carey, star of the new film "Precious: Based on the novel 'Push' by Sapphire", poses with her husband Nick Cannon at the AFI Fest 2009 gala screening of the film in Hollywood November 1, 2009.

Singer Mariah Carey poses with her award for favorite R&B artist at the 2010 People's Choice Awards in Los Angeles January 6, 2010.

Singer Mariah Carey performs during the 2008 Fashion Rocks concert to begin the 2009 Spring/Summer Fashion Week in New York September 5, 2008.

Singer Mariah Carey performs during ABC's Good Morning America Summer Concert Series in Times Square in New York April 25, 2008.

Singer Mariah Carey performs at the "Idol Gives Back" show at the Kodak theatre in Hollywood, California April 6, 2008.

Singer Mariah Carey (L) performs with Jay-Z in New York August 23, 2006.

Singer Mariah Carey waves to fans during an appearance on NBC television's Today Show, in New York May 30, 2003.