Jessica Simpson poses nude on ELLE cover, says she's having a girl

(CBS) Jessica Simpson is baring all for ELLE - posing nude on the magazine's April cover and confirming the sex of her baby.

The pregnant star told the magazine she and fiance Eric Johnson are expecting a baby girl.

Pictures: Celebrity baby bumps
Pictures: Jessica Simpson

"I swear, I will croak if she asks me for a pair of Nikes instead of Christian Louboutins!" said the singer, who also designs an eponymous fashion line and will appear as a mentor on TV's "Fashion Star."

"Eric is so athletic - we're gonna have this athletic girl and I won't even be able to take her shopping," she added.

The couple has decided on a name for their little one, Simpson also revealed.

"We're sure," she said of the moniker. "We're embroidering it on things. It's nothing shocking and nothing you'll have to add to the dictionary. When people hear it, they'll know why."

On Wednesday, Simpson sent a tweet about her cover's debut:

The April issue of ELLE will hit newsstands on March 20.