Stars naked on covers may sell magazines, but can it still stir up controversy? Not likely.Serena Williams has certainly had her fill of controversy. But now the tennis champ is leaving her cute outfits on the court to serve up her buff bod, well, in the buff. The 28-year-old shows off her incredible physique on one of six sexy covers of ESPN magazine's first ever "Body Issue." Tennis definitely does a body good!Williams isn't the only athlete taking it all off...
