Article continues below advertisementDonna D'Errico is reminding everyone that age is nothing but a number. The Baywatch alum, 57, had fans doing double takes after sharing a sizzling Instagram photo that showed off her incredible figure in a leopard-print bikini with red lace trim.Article continues below advertisementSource: @donnaderrico/InstagramDonna D'Errico wowed fans with a leopard bikini photo on Instagram.Article continues below advertisementStanding by a sunlit window, the actress posed confidently in the tiny two-piece, flaunting her toned abs and killer curves.