Princess Diana put pen to paper to thank a fan who wrote to her following her bombshell Panorama interview, and the previously unseen letter is now heading to the auction block.

On June 9, the late Princess of Wales’ handwritten, two-page letter will go up for sale as part of Reeman Dansie’s “Royalty, Antiques & Fine Art” auction.

The letter, estimated to fetch between about $4,040 and $5,385, was sent to a fan named Michael Barratt, who sent a supportive letter to the royal after watching her BBC Panorama interview in November 1995.

According to the auction house, the letter showed that Diana thanked Barrat for his message and outlined “how touched she is by the contents and by his profound words, and in particular relates to his sentiments of self-knowledge and moving on in life.”

Princess Diana’s BBC “Panorama” interview in November 1995.Pool Photograph/Corbis/Getty

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“She hopes the Panorama interview will help other women in similar difficulties, and she looks forward to the future and sharing with and teaching William and Harry the importance of communication on a deeper level,” Reeman Dansie continued, referring to her sons, Prince William and Prince Harry.

“His supportive letter has been invaluable, and she thanks him very deeply. ‘With my best wishes, Yours sincerely, Diana,’ with original envelope with handwritten name and address details by the princess,” the summary said about the letter, written on Diana’s personalized Kensington Palace stationery and dated Nov. 27, 1995.

On Barratt’s reaction, it added, “To his great surprise, a week later, he received this wonderful reply, which he has treasured ever since.”

On Nov. 20, 1997, Princess Diana had a sit-down with the BBC investigative program Panorama. The interview was secretly filmed in her apartment at Kensington Palace while she was separated from then-Prince Charles and later revealed to have been secured by deceitful methods.

Diana’s candid conversation was full of bombshells, including the searing claim that “there were three of us in this marriage, so it was a bit crowded,” regarding her husband’s affair with the future Queen Camilla.

Prince Charles and Princess Diana in South Korea on November 3, 1992.Tim Graham Photo Library via Getty

The future King Charles and Princess Diana separated in 1992 after 11 years of marriage and were ordered by Queen Elizabeth to proceed with a divorce after the interview aired.

Their official split was announced in December 1995 and finalized in August 1996, and Princess Diana died following a car accident in Paris one year later. Diana was 36 at the time of her death.

Also featured in Reeman Dansie’s upcoming  “Royalty, Antiques & Fine Art” auction lot is a sitting sheet that recapped Princess Diana’s session with Madame Tussauds on April 18, 1996.

The two sheets outlined that the waxwork museum’s team “visited Kensington Palace that day to assess hair match, noting that her hair was in ‘very good condition’, eye match, including details of her iris and skin, noting ‘At the sitting Diana was slightly tanned.’ “

Princess Diana in London on November 20, 1995.Tim Graham Photo Library via Getty

The documents also featured details about her makeup, including her “Lancome black” eyeliner and Estee Lauder “All-Day Rose”, “Lip Beige R36” shade.

Four cards featuring sample foundation, powder, eyeliner and lipstick are stapled along, making the lot “a unique opportunity to study the makeup and styling used by one of the most beautiful and famous women in the world,” the auctioneer said.

Reeman Dansie estimates that the item will fetch between about $673 and $1,346 and the lot is also being auctioned on Tuesday, June 9.

Other intriguing memorabilia available for sale are a framed, signed portrait of  Kate Middleton and Prince William in 2011, previous Christmas cards released by the late Queen Elizabeth and the 2025 royal household Christmas gift: a cushion stitched with King Charles and Queen Camilla’s joint cypher, plus box.