Hey, just because you're an adult doesn't mean you have to grow up!

Seriously, let's face it -- though many of us are attempting to adult, we all know that we're really just big kids at heart. So why not show off your fun and kooky side this Halloween with some costumes inspired by kids' shows, movies and books?

From "The Powerpuff Girls," to Darla from "Finding Nemo," these getups will make you feel like a kid all over again -- without the pain of braces or awkward school pictures.

Check out the costumes below!