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Yeardley filed for divorce from Daniel Erickson citing "irreconcilable differences" after six years of marriage.
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Yeardley is 5'4" tall.
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Yeardley is pronounced "Yard-lee."
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On The Simpsons, any time Lisa sings, Yeardley has to drop into her own singing voice.
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Smith has joked about her lack of vocal range in comparison to her Simpsons costars, saying she only has three voices: her own, Lisa's, and one that's somewhere in between.
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In 1992, Yeardley was awarded with an Emmy for Outstanding Voice-Over Performance for her work on The Simpsons.
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As a child she was taunted because of her name. Her classmates would refer to her as Yard Weed, Yard Dog, Yard Bird, Yardstick, to name a few.
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She refers to the taping process of The Simpsons as the "creme de la creme" of animation.
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She enjoys produces art for notecards.
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She has appeared in the films The Legend of Billie Jean, City Slickers, Maximum Overdrive, and As Good as It Gets.
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She was married to Christopher Grove from 1990-1992, until they divorced. She has been married to Daniel Erickson since 2002.
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By the time she was two, she and her family had moved to Washington, D.C., where she was raised.
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She is American but was born in Paris, France where her father served as a correspondent with UPI.
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Her father, J.Y. Smith, who died in 2006, was a longtime obituary writer for The Washington Post.
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Yeardley admitted on The Jane Pauley Show that she had struggled with bulimia for 25 years. Coincidentially, her character Lisa Simpson suffered through an eating disorder in the episode "Sleeping with the Enemy". She is currently performing in a one-woman show called More where she exposes her eating disorder. Yeardley has been binge-purge free for two years as of February 18, 2005.
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She is only one of two actresses, the other being Marcia Wallace, on The Simpsons to regularly play only one character. All of the other actors play ten or more characters.
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Originally read for the role of Bart when auditioning for The Simpsons (1989), but her voice was too high and sounded like a girl, so she lightened her voice up a little and auditioned and won the role of Lisa. Ironically, Nancy Cartwright originally read for Lisa, but was given the role of Bart.