Madonna is a worldwide pop icon, once notorious for her desire to shock. But as she nears 50, she has become a puritanical parent who is a disciplinarian with her children, nine-year-old Lola and Rocco, four. Madonna, married to film director Guy Ritchie, says she has banned television and punishes her daughter's messiness by confiscating her clothes. "I'm a disciplinarian. Guy's the spoiler," she says in an interview with Harpers & Queen magazine. "When Daddy gets home, they're going to get chocolate. I'm more practical; I worry about their teeth and make sure they're getting their schoolwork done. I'm very...