Mariah Carey Slips Up: Twins On the Way?

Could Mariah Carey be having twins?

The 40-year-old All I Want For Christmas singer finally confirmed last month the long-swirling rumors she's pregnant, but the might have let another cat -- or two -- out of the bag in a recent radio interview, RadarOnline.com has learned.

Carey, promoting her new holiday album with Radio Disney's Ernie D, said she's been singing new holiday songs from her new album to her baby bump.

"I just hope that they don't turn out hating Christmas!" she said.

The Hero singer has said she and her talented hubby Nick Cannon are expecting in the spring.

Last month, Cannon, 30, said of his forthcoming fatherhood: "The greatest gift on earth is a child.

"We've had names picked out from the first day we met and we want to stay true to that," he said.

Carey's new disc, Merry Christmas II You, is in stores now.

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