In a searing court attack on Charlie Sheen, actress Denise Richards alleges that her estranged husband is unstable, violent, addicted to gambling and prostitutes, and visits pornographic web sites featuring young men and girls who appear underage. In a remarkable sworn declaration (a copy of which you'll find below) filed today in Los Angeles Superior Court, Richards also charges that Sheen, 40, assaulted her and threatened her life during a December 30 incident at the actress's Los Angeles home. Richards claims that an enraged Sheen--who was over for a visit with the couple's two children--told her she was "fucking with...