Pregnant Jessica Simpson poses naked for ELLE

Pregnant pop star Jessica Simpson has channelled her inner Demi Moore by posing naked on a magazine cover - and revealed she's expecting a baby girl.

The singer was photographed exposing her bulging baby bump for the new edition of Elle in the US and told readers she and her fiance Eric Johnson know the gender of their unborn child, which is due in the next few weeks.

The pose is reminiscent of Ghost star Moore's 1991 Vanity Fair photoshoot, and Simpson opens about her baby daughter in the interview, revealing the couple has already chosen a "non-traditional name" for her.

"We're sure on the name ... We're embroidering it on things. It's nothing shocking and nothing you'll have to add to the dictionary. Still, when people hear it, they'll know ... why," she says

Simpson also hopes the tot doesn't take after her sportsman father, adding, "I swear, I will croak if she asks me for a pair of Nikes instead of Christian Louboutins! Eric is so athletic - we're gonna have this athletic girl and I won't even be able to take her shopping, 'cause all she's gonna want is sports bras and Nikes."