Opener Photo: Gregory Pace/BEImages.

Childhood photos of your favorite celebrities are always an fun curiosity. Somehow we're always amazed that young Natalie Portman looks exactly like older Natalie Portman. Or maybe we discover that a celeb really grew into their looks (or at least a different look). And of course, these pics are also a window into their early personalities.Were they sporty or artsy as preteens? Did they dress in high fashion, like they do now, or favor sweats? These Halloween photos snapped during the stars' younger days should give some insight into what they loved as children. And if you find any inspiration for your own holiday ensemble, it can be a double costume. You'll be going as the character, and the celebrity as a kid as well.