GETTY The Princes filmed their parts on their recent trip to Pinewood Studios

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The Princes donned stormtrooper uniforms, including helmets which will conceal their identities on screen if they make the final cut. In a very public visit, William and Harry took a tour of the studio, joking with Luke Skywalker actor Mark Hamill and getting a bear hug from Chewbacca along the way. But after being shown around the studio the set was cleared – leaving the two princes, the director, producer and essential crew members to secretly film the scene that could feature in the eighth Star Wars blockbuster.

GETTY The royals are believed to have filmed alongside Daisy Ridley and John Boyega

A source told The Mail on Sunday: “The line given was that they were going to have lunch and a private tour of the rest of the set. “What really happened is that the director came over and told them it was time to “get suited” and off they went to the wardrobe department. It was then the Princes played their parts alongside Daisy Ridley and John Boyega, who played Rey and Finn in The Force Awakens, and Oscar-winner Benicio del Toro.

GETTY A source said "It’s obvious they are genuine Star Wars fans."

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The insider added: “The Princes dressed up in full Stormtrooper gear and filmed a scene in which Rey and Finn infiltrate a secret base. “The rebel characters are in a lift with Benicia del Toro’s character when a group of Stormtroopers enter – two of whom are William and Harry.” But William didn’t get back into his clothes straight after the shoot. The future king kept his stormtrooper uniform on to present one stunned crew member with a birthday cake.

GETTY Harry got up close and personal with Chewbacca on the tour