The 25-year-old actor, who reprises his role as Finn in the popular sci-fi franchise's next, had been dropping hints about the royals' cameo in the film since August.
During The Hollywood Reporter's Actor Roundtable, Boyega revealed that he features in a scene with both William and Harry, along with actor Tom Hardy, with them "wrapped in Stormtroopers costumes" for a "strange contrast of a weird family".
The actor added, "It's the best of both worlds for me."
Singer-songwriter Gary Barlow, who earlier denied that he was playing the role, also stars in the eighth chapter of the series as another Stormtrooper guarding Boyega's character in an elevator.
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