The two brothers had originally invited 100 of their mother's friends, supporters and former staff to the momentous event. Pop legend Elton John and David Furnish, who contributed to the funding of the memorial, were some of the famous names due to be present. However, Covid rules have apparently forced the brothers into a major rethink.

       The event will now be attended only by the Princes and some of the Spencer relatives, according to the Daily Mail.

       William and Harry are reported to be trying to arrange a new date in September for the rest of the guests.

       The royal brothers commissioned the statue from sculptor Ian Rank-Broadley on the 20th anniversary of Diana's death in 2017.

       At the time, they said they wanted to create a fitting monument to honour her legacy.

       In a press release, they stated: "It has been 20 years since our mother's death and the time is right to recognise her positive impact in the UK and around the world with a permanent statue."

       They added: "Our mother touched so many lives."

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       The statue was finished in 2018.

       Although the relationship between William and Harry is strained, the two royals are by all accounts determined to put on a unified front.

       They will deliver separate speeches at the event, which takes place in the Sunken Garden at Kensington Palace.

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       This was reportedly one of Princess Diana's favourite places.

       Diana tragically died in a car accident in Paris along with her boyfriend Dodi Al-Fayed on August 31, 1997.

       She would have turned 60 on July 1, the day of the unveiling.