It was Kevin Federline and his girlfriend Victoria Prince's turn to take the boys to the pool in Miami over the weekend. Yesterday Britney, Jamie Lynn and Lynne showed off their bikini bodies with Sean Preston, Jayden James and Maddie — but Kevin's bulked up physique is the one turning heads this time. There have been rumors that the formerly fit backup dancer/aspiring rapper was putting on the lbs for a weight loss show, but either way he looks a lot different than he did a few years back. At least the boys look happy splashing around with dad and his girlfriend in the pool.