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Credit: Splash News Online; Steve Granitz/WireImage.com
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Justin Timberlake
The Memphis, Tennessee, native began taking voice lessons at age 8. He was 12 when he landed a spot (opposite ex Britney Spears, Christina Aguilera and Ryan Gosling) on Disney's The Mickey Mouse Club in 1993. "In my younger years...[working] was really all I cared about," he has said.