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Nancy Cartwright (born on October 25, 1957) is a voice actress, film and television actress, and comedian. Nancy is most famous for voicing Bart Simpson, Nelson Muntz, Ralph Wiggum and other characters from The Simpsons and Rufus from Kim Possible. She first provided the voice for Prudence from the Rugrats episode "Showdown At Teeter-Totter Gulch". In 2002, after Christine Cavanaugh retired from voice acting, she took on the role of voicing Chuckie.