Serena Williams turned up the heat in a yellow swimsuit. Williams, 43, showed off her bikini body via Instagram on Thursday, August 21, in a neon one-piece while posing in the ocean. The tennis pro struck a pose with her hands on her hips as she gave fans a glimpse of her figure after opening up about losing 31 pounds with GLP-1 medication. Her swimsuit featured a scoop neck, spaghetti straps, a bow that tied over her chest and a small cutout. Williams styled the look with a silk green scarf tied around her neck and round black sunglasses.