Previously unreleased images of Princess Diana and her sons, the Duke of Cambridge and Prince Harry as young boys were published ahead of an intimate documentary about Diana, marking 20 years since her death.

Princess Diana

This photograph released by Kensington Palace, from the personal photo album of the late Diana, Princess of Wales, shows Prince William and Prince Harry in borrowed policemen outfits, and features in the new ITV documentary ‘Diana, Our Mother: Her Life and Legacy’, which aired on ITV at 21.00hrs on Monday 24th July.

The never before seen pictures include a photo of the boys, dressed in borrowed police helmets and ties, as well as an image of a tanned Diana wrapping her arms around a young prince Harry, both smiling on Holiday. Speaking about the photo of his mother and Harry during one of the many poignant moments throughout the documentary, William says: “This one here, I thought you’d like to see, quite a special picture, the two of you, which I thought was quite sweet.” In response, Harry joked: “I just remember having the skinniest legs, and still do.”

Princess Diana

This photograph released by Kensington Palace, from the personal photo album of the late Diana, Princess of Wales, shows the princess and Prince Harry on holiday.

While another, equally beautiful portrait actually shows a pregnant Diana, holding a baby William in her arms while wearing a pink sweater. Both look relaxed in the candid portrait. One of the first things you notice is the startling similarity between William and his son, Prince George. The images, released by Kensington Palace, come from Diana’s personal photo albums and feature during the ITV programme.

Princess Diana

This photograph released by Kensington Palace, from the personal photo album of the late Diana, Princess of Wales, shows the princess holding Prince William whilst pregnant with Prince Harry.

Harry admits during the documentary that he was dreading looking at the images but wanted to wait for the right time to sit down with his older brother and going through the photo albums. The brothers, reflecting on their mother, lament that there are not that many pictures of Diana in the photo albums as she was often the one taking the pictures. William explains during the show “she loved taking pictures, it was so nice. She captures some really good portraits of people, you kind of get a snapshot of their personality quite quickly.”

Princess Diana

This photograph released by Kensington Palace, from the personal photo album of the late Diana, Princess of Wales, and taken by Prince William shows the princess sitting and playing with Prince Harry on the Royal Yacht Britannia.

Princess Diana

The Princess of Wales with her sons, Princes William and Harry. The Duke of Cambridge and Prince Harry have revealed their last conversation with their mother was a brief phone call on the day she died that now weighs “heavily” on William’s mind.

The release of the images coincided with the showing of an ITV documentary, Diana, Our Mother: Her Life and Legacy. As her family and the country reflect on her passing 20 years on, there have been a number of tributes paid to Princess Diana from members of the royal family, famous friends and members of the public.

Jo Dobson [pictured above] holds a large framed collage of pictures of Diana, Princess of Wales at her home in Gloucester, where the Diana super-fan has a huge memorabilia collection and has donated pieces to the Gloucester Life Museum for an exhibition to mark the milestone 20th anniversary of the Princess’s death.