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Mariah Carey to show off pregnancy weight loss and babies in tv interview

Singer Mariah Carey will show off her slimmed-down post-pregnancy physique and her adorable six-month-old twins on an ABC News interview that will air Oct. 21, 2011.

In a just-released preview, a beaming Carey, 41, and husband Nick Cannon, 31, gush over their twin son and daughter, Moroccan and Monroe.

[UPDATE: Mariah flaunts pregnancy weight loss, adorable twins]

Treadmill and Pool Workouts

Mariah, who finally got pregnant last year after undergoing hormone treatments, has been doing lots of cardio exercise on the treadmill and weight workouts in the pool to get back in shape.

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"She does long, long hours on the treadmill," said Cannon. "Obviously [she pays attention to her] diet and eating properly."

Mariah, who has battled weight issues for years, was thinner than ever in 2008 after following a strict high-protein, low-calorie, low-carb diet and working out 60-90 minutes a day.

Carey's weight has since fluctuated, but husband Nick gushes that the Grammy winner is more determined than ever to regain slender 1990 physique.

"I personally think she's going to come out looking better -- looking like it's 1990!" gushes Cannon.

"I think that's what she's aiming for, and I think she'll reach that goal."

, Celebrity Fitness and Health Examiner

Samantha Chang is the executive editor and co-owner of TheImproper.com, an arts and entertainment website in New York City. A graduate of the University of Pennsylvania, Samantha is a former financial journalist who enjoys running, cycling and music. Contact her at schang@theImproper.com.

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