Serena Williams, 30, and Venus Williams , 31, Palm Beach Gardens, tennis stars

Venus and Serena Williams have helped transform women¿s tennis. The two champions live in Palm Beach Gardens, where they have a training facility. Both sisters have done much charity work. Serena Williams, a 13-time Grand Slam champion, has done work for UNICEF, and Venus Williams supports the Elton John AIDS Foundation. ¿They have done a lot not only for tennis, for women¿s sports in general,¿ said tennis star Vera Zvonareva, in 2011 news story.