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10. Demi Lovato - Demetria Devonne Lovato began her career as a child actor. She starred in the PBS series " Barney and Friends " and received her breakthrough role as Mitchie Torres in the Disney Channel TV movie " Camp Rock " and its sequel " Camp Rock 2: The Final Jam. " Lovato has been nominated for two Grammys and comes in 10th in the 2018 Ranker poll.