Article continues below advertisementRod Stewart's wife, Penny Lancaster, revealed she helped breastfeed stepdaughter Kimberly Stewart's daughter, Delilah, when the socialite wasn't producing enough milk.Penny shared the surprising confession in a new interview, noting she gave birth to a baby boy six months before Kimberly, now 46, became a mother in 2011.Article continues below advertisementPenny Lancaster Breastfed Her GranddaughterSource: megaRod Stewart's wife, Penny Lancaster, breastfed her granddaughter, as she gave birth to her own child six months earlier.