Prince William and Prince Harry attended a service to re-dedicate the grave of their mother, Princess Diana, on Saturday (01.07.17).
The princes, along with William's wife Duchess Catherine and their children, Prince George, three and Princess Charlotte, two, took part in the ceremony at Diana's family home Althorp House in Northamptonshire on what would have been her 56th birthday.
The private service, which their father Prince Charles did not attend as he is in Canada with his wife Duchess Camilla, was conducted by the Archbishop of Canterbury, Justin Welby.
A statement, previously released by Kensington Palace, stated: "The Duke and Duchess of Cambridge and Prince Harry will attend a private service to re-dedicate the grave of Diana, Princess of Wales at Althorp House on Saturday 1 July.
"The service, which will fall on what would have been The Princess's birthday, will be conducted by The Archbishop of Canterbury and attended by her family."
Diana died on 31 August, 1997 in a car crash in Paris at the age of 36 and there is a black silhouette of the late royal at the Temple near the lake in Althorp.
Earlier this year, it was revealed that William and Harry had commissioned a statue of Diana to be erected in the grounds of Kensington Palace, where she lived.
Both William and Harry currently live in the palace, while some parts of the building are open to the public.
A message on the official Kensington Palace Twitter feed stated: "At the request of The Duke of Cambridge & Prince Harry a statue of Diana, Princess of Wales is to be erected at Kensington Palace."
And the princes said in a statement: "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.
"Our mother touched so many lives. We hope the statue will help all those who visit Kensington Palace to reflect on her life and her legacy."
The statement added: "The princes have convened a committee to commission and privately raise funds for the creation of the statue. The committee will advise on the selection of the sculptor and will work with Historic Royal Palaces on the statue's installation in the public gardens at Kensington Palace."
Their grandmother Queen Elizabeth added that she "supports" her grandchildren commemorating their mother.