Serena Williams: 'Who Let The Donk Out'

Tennis star Serena Williams enjoyed a day at the beach in her two piece with her friends out in South Beach. She also took a splash in the water to cool that gigantic ass of hers off,lol.That has to be the biggest donk on the planet!More with Serena and her badonkadonk after the jump.. 

Photos: PacificCoastNews