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Cast Members: Amy Poehler, Bridgit Mendler and Carol Burnett in Los Angeles "The Secret World of Arrietty" opens February 17, 2012. An animated adventured based on Mary Norton's award winning children's book series "The Borrrowers". . Residing quietly beneath the floorboards are little people who live undetected in a secret world to be discovered, where the smallest may stand tallest of all.  From the legendary Studio Ghibli (“Spirited Away,” “Ponyo”) comes “The Secret World of Arrietty,” an animated adventure based on Mary Norton’s acclaimed children’s book series “The Borrowers.” Arrietty (voice of Bridgit Mendler), a tiny, but tenacious 14-year-old, lives with her parents (voices of Will Arnett and Amy Poehler) in the recesses of a suburban garden home, unbeknownst to the homeowner and her housekeeper (voice of Carol Burnett). Like all little people, Arrietty (AIR-ee-ett-ee) remains hidden from view, except during occasional covert ventures beyond the flo...