Former members of staff and celebrities are set to pay tribute to Princess Diana at East London's Mildmay Mission Hospital later today (31.08.17).
The British royal died in Paris, France, on August 31 1997 and to mark the 20th anniversary of her passing, former members of staff, actress Linda Robson, and dancer Wayne Sleep will all attend a service at the hospital, where the princess regularly visited during her lifetime.
Princes William and Harry will be marking the anniversary in private, but members of the public are also expected to visit Kensington Palace, where Princess Diana lived for more than a decade.
Terry, who had met the princess through his charity work, has already laid roses for her outside the gates of the Palace and he has praised the royal.
Speaking to the BBC, Terry shared: "It was a privilege [to meet her].
"I was under Waterloo Bridge, giving out blankets and food to the homeless. I don't know what made her come, but she looked down at us all and we were all amazed, just like a little angel came out."
Terry also praised the princess for finding time for everyone during her fundraising efforts.
He said: "She spoke to us all. She was very sweet. It was unbelievable. Everybody gave her a smile and she gave them a lovely smile too."
On Wednesday (30.08.17), Princes William and Harry spent time reading messages and cards left at the gates of Kensington Palace in memory of their mother.