Mariah Carey and Nick Cannon are working on a children's book.

Scholastic has announced that it has acquired the couple's Roc and Roe's Twelve Days of Christmas, a picture story due for publication this autumn.

Illustrated by AG Ford, the book is a holiday tale featuring twins Moroccan and Monroe, to whom Carey gave birth in 2011.

Scholastic is billing the book as an "adorable" take on a famous Christmas carol.