Princess Diana expressed a private regret days before her death – and it had to do with her two sons.

Rosa Monckton, Diana’s close friend and confidant, has revealed that the late royal regretted sitting for her now-infamous “Panorama” interview because she was worried that it had hurt Prince William and Prince Harry.

“She told me she regretted doing it because of the harm she thought it had done to her boys,” Monckton, 72, told People in a story published Monday.

Diana reportedly made the admission during a summer holiday with Monckton in Greece just 10 days before she tragically died at 36 following a high-speed car crash in the Pont de l’Alma tunnel in Paris, France, on August 31, 1997.

The “Panorama” interview, meanwhile, took place in 1995 when William was 15 years old and Har

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