Princes Harry and William joined a host of stars ncluding Mark Hamill, John Boyega and Daisy Ridley at the premiere, hosted in aid of The Royal Foundation, at the Royal Albert Hall. 

And the princes are not just supporting the UK-made film, which was shot at Pinewood Studios in Watford.

They are also celebrating their big-screen debuts, as they will make cameo appearances as stormtroopers in the new film.

They visited the set in April 2016, and are believed to have shot a scene while they were there.

Star Daisy Ridley spoke out about their “surreal” visit to the set in an interview on Good Morning America.

She said: “It was really funny, it was great because it was so surreal. 

“It’s surreal anyway taking people around the set that’s sort of your home, because it’s weird suddenly being the outsider.”

She continued: “It was great! They’re really, really nice. Also really tall, which was the most surprising thing. They were lovely.”

At 6’2 and 6’1, the Princes are certainly above average height - which could help fans spot their cameos in the film.

The two Princes will reportedly also be in the exact same scene as Tom Hardy and Gary Barlow, who are both also making cameo appearances as stormtroopers.

According to The Hollywood Reporter, they will feature alongside John Boyega’s character Finn, a former stormtrooper himself.

Sources tell the industry publication that they’ll be in an elevator guarding the popular character, although their faces will of course be obscured by those iconic helmets.

Star Wars: The Last Jedi picks up at the end of The Force Awakens, with the Resistance fighting Supreme Leader Snoke’s First Order as it tries to take over the galaxy.

It ends with a dedication to Princess Leia actress Carrie Fisher, who will make her final appearance in the film, after she died in late 2016.

The film comes out on December 14 in the UK.