Prince Harry will lose his HRH title during an exhibition for his mum Princess Diana, it has been reported.
The Duke of Sussex had been referred to by the royal moniker thanks to an accidental administrative error, the Sunday Times reported.
Under the terms of his split from the Firm, the Sussexes were allowed to keep but not use their HRH titles.
A placard at a Kensington Palace exhibition of dresses worn by the Princess of Wales included them however.
It read: “Lent by HRH the Duke of Cambridge and HRH the Duke of Sussex.”
Notices for the dress display, which includes two garments donated by Harry, 36, and William, 38, will now be changed to reflect Harry’s new status, it has been reported.
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A spokesman for the Royal Collection Trust, said the dresses were “loaned by HRH the Duke of Cambridge and the Duke of Sussex”.
They added “due to an administrative error, for which the Royal Collection Trust was responsible, the labels were incorrect and will be updated”.
The two dresses included in the show are Diana’s ivory taffeta and lace wedding gown, designed by David and Elizabeth Emanuel, and her wedding day going-away outfit, a peach skirt suit by Bellville Sassoon.
The exhibition, which runs until January 2, also looks at designers who dressed the Queen, Princess Margaret and the Queen Mother.
Harry and Meghan, 39, officially stepped down as senior royals on March 31, last year.
Their announcement that they would work towards becoming “financially independent” has seen them embark on podcast and TV ventures.
Following the January, 2020 announcement Buckingham Palace confirmed the couple would step back from official royal duties and would no longer use the titles His Royal Highness and Her Royal Highness.
It was reported yesterday that Harry and Meghan have been moved below the Wessexes on the Royal Family’s website following their move to the United States.
The family section of the website appeared to be under construction with profiles of senior royals being moved around.
The Sussexes now sit beneath Harry’s father Prince Charles and Camilla, the Duke and Duchess of Cambridge, Princess Anne, Prince Andrew and the Wessexes.
The website says the couple will be “balancing their time” between the UK and North America, in light of their move to Los Angeles.
In a description, the website says: “They are continuing to honour their duty to The Queen, the Commonwealth, and their patronages.