 Maggie 's <unk> and occasional speaking parts are currently provided by Nancy Cartwright , but she has also been voiced by guest stars James Earl Jones , Elizabeth Taylor and <unk> Foster , and by series regulars <unk> Smith and Harry Shearer . Maggie has appeared in various media relating to The Simpsons – including video games , The Simpsons Movie , The Simpsons Ride , commercials and comic books – and has inspired an entire line of merchandise . 
