Katie Holmes says she's converting to the Church of Scientology, embracing the religion of her boyfriend, Tom Cruise. Holmes, in London to promote her new film, "Batman Begins," said Monday that she's excited about her lessons in Scientology, a religion founded by science fiction writer L. Ron Hubbard. The 26-year-old actress and Cruise went public with their romantic relationship in April. The former Catholic and star of television's "Dawson's Creek" grew up with a poster of Cruise on her bedroom wall and has said she grew up wanting to marry him. "We all keep dreaming, and luckily, dreams come true,"...