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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NICOLE SCHERZINGER

She was only 9 when the Pussycat Doll put together this outfit. "I loved dressing up as Carmen Miranda," says Scherzinger. "The costume was such a production, especially the fruit on my head. But I always won every costume contest I entered in this!"