The wife of Robert Downey Jr. has filed for divorce from the problem-plagued thesp six years after they initially separated. Deborah Falconer cited irreconcilable differences as the cause of the split and is seeking custody of their 7-year-old son, Indio. Meanwhile, Downey — who is due back in court Monday to face drug charges stemming from his Thanksgiving weekend arrest — reportedly has signed on to do another 11 episodes of Ally McBeal. He picked up a Golden Globe Sunday night for his guest-starring work on the Fox dramedy.