Mariah Carey, Nick Cannon Debut Twins On '20/20' (VIDEO)

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They're finally here!

Mariah Carey and Nick Cannon debuted their six-month-old twins, Morrocan and Monroe, on ABC's "20/20" Friday night, and talked about struggling with a miscarriage and dealing with an extremely tough pregnancy.

Carey and Cannon married in 2008, after only a few weeks of dating, and the singer became pregnant shortly thereafter. However, things didn't go as planned.

"It was really tough," Carey said of having a miscarriage, adding that the couple then decided to try fertility treatments, in addition to adopting a more zen-like lifestyle, in order to conceive.

When they found out they were expecting twins, they were thrilled, but the pregnancy did take its toll on Carey.

"I don't think I understood the enormity and the magnitude of what it really does to your body ... Carrying two babies? Unless somebody's been through it, it's difficult to understand that I went through," she said.

Bed rest, false labor and many emergency trips to the hospital dominated a large portion of her pregnancy, and Carey admits that by the end, she had to have help to just get out of bed and use the restroom.

By April 30, her doctor, concerned for the health of mom and babies, delivered the twins via C-section as Carey's live version of her hit song, "Fantasy," played in the background, with dad Nick playing DJ.

"The only reason I wanted the live version was so they could hear the applause upon entering the world," Carey said.

The singer and radio host have been leading up to the big premiere all week, first announcing the ABC special on their website, and launching an official site for Roc and Roe, lovingly called DemBabies.

"Morrocan has several nicknames, one of them is RocStar (Roc*) and you'll see why in a few of the pictures!" the couple shares on the site. "Although it's a bit early, the camera seems to love Ms. Monroe and vice versa. To us it's amazing to see their personalities shine through. They're such beautiful people already."

For the full interview with Mariah Carey and Nick Cannon, head over to ABC, and check out some personal photos of Morrocan and Monroe below!

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