D'oh! Harry Potter creator J. K. Rowling is about to enter the wacky world of The Simpsons. In an upcoming television episode, Homer, Marge, Bart, and Lisa find themselves in London, where every American stereotype of the English will be played to the hilt. When the Simpsons bump into Rowling outside a London bookstore, eight-year-old Lisa's dreams of meeting the author finally come true. "The Regina Diaries" is now in production and will be broadcast on FOX this fall. Rowling will record her own dialogue in England.