FIREFLY EXPERIENCE/2016 LINEUP ft. megAutoplayShow ThumbnailsShow CaptionsLast SlideNext SlideClaymont-based singer Nadjah Nicole performs on The Voice Monday night.(Photo: Paul Drinkwater/NBC)Maroon 5"s Adam Levine said he was "blown away.""It was incredible," pop princess Gwen Stefani added.And country star Blake Shelton flat-out gushed, "You look like a star. You sound like a star."For Delaware"s Nadjah Nicole Pennington,...