The royal couple were joined by Prince Harry as they officially opened the £100 million Warner Bros studios in Leavesden near Watford.
Other films produced at the sprawling site have included:
All eight harry Potter films
James Bond classic Goldeneye
The first Star Wars prequel - The Phantom Menace
It is also where a major attraction is based telling the story of the boy wizard and giving fans a behind the scenes glimpse into the making of the movies through props, costumes, scenery and special effects.
William were handed a replica of Harry Potter's wand while Kate, who is six months pregnant and wore a £38 polka dot dress from Topshop, wielded Hermione Granger's weapon.
Before the tour the Duke of Cambridge gave a speech and spoke of his hopes that he could fit a baby seat in the Batmobile and took the opportunity to tease his younger brother: