Sin City star Brittany Murphy has wed her screenwriter boyfriend Simon Monjack. The 29-year-old actress and Monjack were seen wearing wedding rings at a Playboy magazine event at the Kentucky Derby on Saturday (05May07). A source tells, "They didn't want photographers to take pictures of their rings because they were waiting to make a formal announcement." Murphy called off her engagement to ex-boyfriend Joe MACaluso in August 2006, following an eight month relationship. She was also engaged to talent manager Jeff Kwatinetz for six months in 2004.