Singer Mariah Carey allowed cameras from The Oprah Winfrey Show into her personal clothes closet to reveal her obsession with collecting lingerie.  She also showed off her slimmer figure in a red bikini and added that she spends an hour a day exercising - mostly in the swimming pool.

Oprah said that Mariah’s main closet is an incredible 3,000 square feet, and that she has a secondary walk in closet just for her lingerie in her new apartment in NY. The sexy sleepwear is arranged by color and includes items from one of her favorite vacation spots, Capri, Italy.  It's no secret that Mariah loves femininity.

The Grammy winner also shared some of the workout and diet secrets that helped her slim down in time to promote her brand-new CD, E=MC2, "The Emancipation of Mariah Carey to the Second Power."

As well as rigorous workouts, Carey has cut out fatty foods and items cooked in butter, which she insists hasn't been easy - because it meant giving up her beloved macaroni and cheese.  Mariah decided to get in shape last year after a friend made a comment about her figure.