Kate Middleton’s appearance at the Wimbledon Tennis Championships on Sunday was likely her last public outing for the foreseeable future, according to a royal author.

The Princess of Wales, 42, was greeted with a standing ovation at the annual grand slam — four months after she revealed her cancer diagnosis to the world.

Prominent royal author Robert Jobson, who penned the forthcoming book “Catherine, the Princess of Wales: A Biography of the Future Queen,” has given insight into the royal’s recovery plans.

Kate Middleton’s appearance at the Wimbledon Tennis Championships was likely her last public outing for the foreseeable future, according to a royal author

“Before, she used to live her life by the calendar, and now she is living her life, and the calendar comes in after,” Jobson told People.

“She will be back, but when you have had an experience like this, it changes your perspective and the order of things.”

The Post has reached out to Kensington Palace for comment.

The mom of three delighted fans as she arrived at the All England Lawn Tennis Club alongside her 9-year daughter, Princess Charlotte, and sister Pippa Middleton.

An expert lip reader has since decoded the beloved royal’s reaction to the roaring applause she received upon arrival at Sunday’s match-up.

The Princess of Wales, 42, was greeted with a standing ovation at the annual grand slam on July 14

And Jobson told the outlet that Princess Catherine “showed a lot of courage and character, as she knew that the world was watching.”

His comments were echoed by a palace insider, who told the outlet that her outing likely gave her “sustenance.”

“She has gone through something awful and stressful, and it is crucial to have little wins to look forward to or to give you the courage and energy to go forward. And this was it,” the source said.

After the mother of three declared her disease finding in a pre-kept video in Spring, she avoided the public eye to focus on her treatment cycle.

Only three months after the fact, the imperial wrote in a letter that she was “gaining great headway” yet had “great days and terrible days” while going through chemotherapy.

The next day, she joined the imperial family for Lord Charles’ birthday festivities on the Buckingham Royal residence gallery at the Marching the Variety function.

With two high-profile public appearances added to her repertoire this year, the princess will be getting back to life away from the spotlight as she proceeds with treatment.

The Waleses will apparently spend the warm summer at their farm house of Anmer Lobby, situated on the Sandringham home in Norfolk, Britain.

In June, the princess joined the royal family for King Charles’ birthday celebrations on the Buckingham Palace balcony at the Trooping the Colour ceremony

“She won’t have to be on center stage,” an insider told the outlet. “Being with her family and just being herself will give her energy. There will be plenty of time to focus on her recovery.”

It’s likely that Middleton, along with her husband, Prince William, and their three children, George, Charlotte and Louis, will meet up with King Charles and Queen Camilla at Balmoral Castle later on, where their majesties will be spending their summer.