"Simpsons" fans know all too well that Bart isn't very likely to open a book -- let alone write one, but Bart's alter-ego, Nancy Cartwright, has a different agenda entirely. Cartwright, the famous voice behind Bart Simpson on the animated television series "The Simpsons," wears many hats. Her latest venture is a book called "My Life as a 10-Year-Old Boy," which hits store shelves today. The book details her career, and provides an in-depth look into the show and the dozens of celebrities who have guest-starred on it. Cartwright told the Dayton Daily News that being a behind-the-scenes celebrity has its perks. "I can either have it or not have it and it's sort of up to me to decide because people don't recognize me." As for Bart, Cartwright says she has no plans to close the book on him "as long as the (show) writing remains fresh."