Prince William & Harry Geek Out Over The Dark Knight

4/26/2013 10:45 AM PDT

Prince William & Harry -- Geek Out Over the Dark Knight

Prince William and Prince Harry bow down to someone else other than the Queen ... the Dark Knight.

The Royal brothers -- along with pregnant Kate Middleton -- went batty acting like little kids checking out props from "The Dark Knight" trilogy at the opening of the new Warner Bros. Studios Leavesden in London on Friday.

Even heirs to the throne think Batman is cool.