Tennis star Serena Williams, who last dated director Brett Ratner, has a new man. The 2003 Wimbledon champ, dressed in a shiny baby-doll dress, was spotted holding hands & getting “very close” with rapper Common last week at Tenjune during a party for her sister, Venus. “They were very friendly, arm-in-arm. She looked great,” said a spy. “All night they were sitting together. They were keeping it cool, but you could tell Common likes himself some Serena. I asked a friend of his and was told they are dating.”