Prince Harry is set to turn 40 next week, with  a huge birthday bash reportedly planned for the Duke of Sussex’s special day.

Now living in California, the prince will be celebrating his birthday on September 15 with his wife Meghan Markle, their children, and a whole host of A list celebrity pals.

However, while it is unlikely that any members of the Royal Family will fly over the pond to join in with the party, many are expecting the family to acknowledge the prince in some way under a rule set by the late Queen.

According to The Sun’s former royal correspondent Charles Rae, non-working royals will only get a public greeting under a certain circumstance under the monarch’s new social media rule.

Speaking to GB News, Rae said this was when “their birthday ends in a zero”, as this tends to mark milestones.

He did not see his brother during his brief visit.

As well as his father, Harry is also believed to have maintained good relationships with his cousins while living in America, including Eugenie and Beatrice.

Although they have not been publicly spotted together for a while, there are no signs of rifts between the cousins, who were saved from being mentioned in Harry’s memoir Spare.

Despite the family complications, it is unlikely that any celebrations will be held for Harry’s milestone birthday in the UK, with the duke set to jet off to New York City just days after his California party.