Serena Williams proudly displaying her growing baby bump while also making a playful reference to the size of her buttocks. The retired tennis champion, currently on vacation in Italy, shared two photos on Instagram that captured her posing confidently in a sleeveless black body-con dress accessorized with pink shoes.“CAUTION: Things are not always as they appear,” she joked in the caption. “I am seriously trying to figure out if the baby is in the front or....back....slide right #summer #italy #vacation.”Una publicación compartida por Serena Williams (@serenawilliams)The initial photograph shows Williams standing upright, facing the camera, while in the second shot, she poses to accentuate her growing belly.