If you're planning to travel to the U.K. in early 2004, please be advised: Mariah Carey is threatening to make her London stage debut next year in The Sleeping Prince, the vintage comedy that served as the inspiration for the 1957 film starring Laurence Olivier and Marilyn Monroe. "Mariah wants to get rid of the glitz and tassels," the show's producer, Bill Kenwright, tells Variety. "She wants to be an actress."