The brothers and Diana’s siblings attended the statue unveiling on what would have been the late royal’s 60th birthday.
During the brief ceremony, William and Harry pulled away a cloth covering the statue of Diana.
The brothers, who have been at the centre of an ongoing rift, also released a joint statement.
Speaking at the time, royal author Penny Junor said the pair put on a “very good show”.
Ms Junor said: “I think the brothers put on a very, very good show.
“I was expecting to see some sort of tight lips and some jaw muscles which we saw at the Commonwealth service in Westminster Abbey before Harry and Meghan left.
“They weren’t arms around each other, it wasn’t very touchy and there wasn’t, perhaps, the usual banter of times gone by.
“But had you not known there was a serious problem between the two of them, you wouldn’t necessarily have picked it up.”
Harry laid bare his rift with his older brother during his and Meghan Markle’s Oprah Winfrey interview in March.
He said: “The relationship is ‘space’ at the moment. And time heals all things, hopefully.”
Harry also claimed William, who is second in line to the throne, was “trapped” in his royal role.
He previously travelled to Britain in April for Prince Philip’s funeral, where he and Harry were separated by their cousin Peter Phillips in the procession.
Harry and Meghan quit royal duties in March 2020 for a new life in America.
Source: EXPRESS CO UK