Instead, Diana's two sons will be in attendance, in addition to some of the late princess' relatives.
The original plan was to have more than 100 of their mother's friends, former staff and supporters, but they had to re-think their list due to the ongoing pandemic. According to the outlet, a bigger party will take place in September, but it's unclear if Harry would fly back home for it.
Sculptor Ian Rank-Broadley and gardener designer Pip Morrison will also be there on July 1.
"The statue that Prince William and Prince Harry have commissioned to commemorate their mother, Diana, Princess of Wales, will be installed next year on what would have been her 60th Birthday," a statement said last year. "The statue was commissioned to mark the 20th anniversary of her death and recognize her positive impact in the U.K. and around the world."
The message continued, "The statue will be installed in the Sunken Garden of Kensington Palace on 1st July 2021, marking the Princess’s 60th birthday. The Princes hope that the statue will help all those who visit Kensington Palace to reflect on their mother’s life and her legacy."
The brothers will reunite for the second time this year — and it looks like they will do their best to put on a united front.
“Despite their ongoing issues, Prince Harry and Prince William have communicated about the unveiling of the Princess Diana statue,” a source told In Touch. “They’ll be an opportunity for them to talk in person either just before and after the unveiling.”
The source noted that the siblings are "both on the same page about keeping the peace."