Mariah Carey put on so much weight when she was pregnant with twins that she says she used to hide her body from husband Nick Cannon.

But the Grammy-winning singer has now dropped more than 30 lbs. (13.6kg), and has a new job promoting US weight-loss company Jenny.

Carey, 42, joined the weight loss program, formerly known as Jenny Craig, in late July just three months after giving birth to her first children - twins Moroccan and Monroe.

The first-time mom told a news conference on Wednesday she felt so large at the end of her pregnancy that she avoided learning her weight.

At her heaviest, Carey was so insecure she even wore a towel to cover her body in the bathtub. "You think I would let Nick see me looking rancid like that?" she asked with a laugh.

Twirling for reporters in a red, fitted vintage Halston dress, she said she would like to see herself looking as she did in the music video for her 2008 hit "Touch My Body".]

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