The People’s Princess supported the royal family, a newly released letter reveals.

The late Princess Diana’s longtime butler Paul Burrell has unveiled a never-before-seen letter penned by the royal, where she admitted that she supports the British monarchy.

The “A Royal Duty” author, 64, recently shared the note — allegedly written between 1993 and 1997 — with the UK edition of OK! magazine (via the Mirror).

“I so want the monarchy to survive and realize the changes that will take to put ‘the show’ on a new and healthy track,” the memo began.

Diana could have been referring to the royal family institution as a “show” — possibly meaning that the organization puts on a united front for the public.

Diana was married to now-King Charles from 1981 until they divorced in 1996. She died in 1997 in a traumatic car crash in Paris.

In her letter, she spoke about her sons, Prince William and Prince Harry, and expressed her unwavering support for Queen Elizabeth.

Diana went on: “I am here to support Mama [the queen] and to bring W + H [William and Harry] up in order to cope with the fast-changing world we live in.”

“I love my boys to death and hope that the seeds I’ve planted will grow and bring the strength, knowledge and stability that is needed,” she added.

Burrell then explained to the publication why he felt it was necessary to release Diana’s “poignant” words just before Charles’ coronation on May 6.

“She was a monarchist,” the “I’m a Celebrity…Get Me Out of Here!” star said of the Princess of Wales’ political leanings.

“She loved the royal family, and she wanted the royal family to survive. And also, the fact her sons William and Harry were part of this, what she called, ‘The Show,’ ” he continued.

Burrell then claimed that she would have been supportive of Charles, 74, and his 75-year-old wife, Queen Consort Camilla — if she was still living today.

Diana could have even been invited to the couple’s crowning on Saturday, standing by the Firm’s side and not holding any “animosity.”

“I always think to myself, ‘What would she do in this situation?’ And she would have been at the coronation looking glorious, in her 60s, outshining everyone the way she did,” Burrell mused.

Charles’ coronation will take place at Westminster Abbey. The scaled-back ceremony will take up just one hour of time — as opposed to his mother’s three-hour event back in 1953.

The coveted guest list has been chopped down from 8,000 to 2,000.

Estranged brothers William, 40, and Harry, 38, will attend their father’s coronation later this week, however, they will be keeping their distance from one another.

The Duke of Sussex will allegedly be seated several rows behind William and other senior members of the royal family during the bash. 

The men have not been seen together since the funeral for Queen Elizabeth in September.