Before They Were Stars: Halloween Costumes!

See Carrie Underwood as a bunny, Nick Jonas as the Blue's Clues pooch and more stars when they were still trick-or-treating!

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JEWEL

"I'm the mouse,” says the Perfectly Clear singer, here at age 6. "It was a left over costume from a local Anchorage, Alaska, production of The Nutcracker. "My parents found it in the closet, and, presto – instant Halloween costume!"