Keys, 33, has three-year-old son Egypt Dean with husband Swizz Beatz, reported E! Online.
They are telling me December 31st," Keys replied when asked about her due date.
Keys, recently went nude in a photo, where she is shown clutching her breasts and there is a giant peace sign painted on her belly.
When the singer was asked about the photograph, Keys said the portrait was symbolic because she wants a peaceful world for her children.