Yes, she most certainly is. Aside from being the most beloved female athlete of this generation, Williams has expanded her brand power to films, television, and fashion. She starred and did voice roles for a few television shows, and she also appeared on the cover of various magazines. She launched a line of clothing in 2004. It is called Aneres, and it comes complete with her signature collection of handbags and jewelry.
Venus and Serena have also published their books. They wrote their first book titled, "Venus and Serena: Serving From the Hip: 10 Rules for Living, Loving and Winning." In 2009, Serena wrote her biography called, "On the Line." Also, she is the solitary tennis player to ever accomplish a golden career grand slam in singles and doubles. She has four Olympic gold medals, and she has also been linked romantically with rapper, Common until the two broke-up in 2010.