On Saturday,
Mandy Moore tried her luck at a Texas Hold 'Em poker tournament thrown by tennis champ
Andy Roddick. Moore joined
Nicky Hilton and
Venus and
Serena Williams at the Seminole Hard Rock Hotel and Casino in Hollywood, Florida, to gamble and do some good. Proceeds from the evening went to the
Andy Roddick Foundation, which supports charities that help abused and at-risk children.