As the Royal Family tend to brush shoulders with many celebrities and stalwarts of the film screen, it is rare for them to become stars of the show themselves.
And while two actresses have previously married into the family, people are not used to seeing working royals appear on screen, reports the Mirror.
This unspoken rule was thrown out in 2009, however, when Princess Beatrice made a notable cameo in a new film about her lookalike great-great-great-great grandmother, Queen Victoria.
