The Victoria's Secret supermodel, who is due early next year, has peeled off her clothes for W Magazine's family issue, baring her breasts and rubbing her pregnant belly in a sideways view of her body for the black and white shot.
The December publication also features celebrity parents including Madonna and her teenage daughter Lourdes, R&B superstar Usher and his two young sons, and actress Katherine Heigl and adopted baby girl Naleigh.
Hollywood star Moore started the expectant and naked trend in 1991, when famed photographer Annie Leibovitz shot her for the cover of Vanity Fair magazine while she was seven months pregnant with her second daughter Scout.
Spears stripped off for a similar shoot for Harper's Bazaar in 2006, when she was pregnant with her second son, Jayden James.
It Is NOT SAFE FOR WORK or for those who do not wish to see nudity.