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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JONAS BROTHERS

"We did a Harvest Party at our church and the kids could dress up as a positive character," mom Denise Jonas says of this pic from Halloween 1998. "Joseph was Grandpa Grape from Veggie Tales. Nicholas was Blue from Blue's Clues and Kevin, I created that costume out of the pieces, he was the game Operation."