Olympians Venus, Serena Williams —
Sisters Venus and Serena Williams are superstars in the world of tennis -- the pair claimed gold playing doubles at Sydney's 2000 and Beijing's 2008 Games, while Venus claimed an individual top medal in Sydney. Off the court, the sisters have appeared on "Punk'd," "Sesame Street" and "The Simpsons" as well as their own reality show, "Venus and Serena: For Real." But it's Serena who has been especially active in the realm of entertainment, appearing in shows including "ER," "Law and Order: Special Victims Unit" and "My Wife and Kids." She is also set to produce and lend her voice to the upcoming animated film "WimbleToad," but not before both sisters prepare to compete in the 2012 London Games.