Simon Cowell spent yesterday relaxing shirtless in the South of France and catching some rays aboard a yacht. The X Factor judge apparently got a bit more than a Saint-Tropez sea view when his good friend, Britain's Got Talent judge David Walliams, mooned him from another boat. Yesterday, David tweeted, "I just mooned Simon Cowell. From a boat. That is true." Simon is enjoying some vacation time before The X Factor's return on Sept. 12. The Fox hit will see some major changes this season with the addition of new judges Britney Spears and Demi Lovato. During a recent panel discussion for The X Factor in LA, Simon, Britney, and Demi entertained the crowd as they bantered back and forth. The judges will face some competition of their own with NBC's The Voice returning in September and Mariah Carey joining the American Idol judges' table in January.