Tress MacNeille ( born June 20 , 1951 ) is an American voice actress best known for doing voices on the animated television series The Simpsons , Futurama , and Animaniacs . Tress MacNeille ( born June 20 , 1951 ) is an American voice actress best known for providing various voices on the animated series The Simpsons , Futurama , Tiny Toon Adventures , Animaniacs , Rugrats , All Grown Up !