According to DisneyFanatic.com, here are the strict requirements that you need to be a Disney princess. Think you are up to the task? Read on and see here. (Psst...I am already too old, lol)
13 Inscrutable Requirements To Be A Princess In Disney World
http://www.disneyfanatic.com/13-inscrutible-requirements-to-be-a-princess-in-disney-world/