It's been a big month of milestones for the royal family.
Junor made the astonishing claim that Diana confronted Camilla publicly at a party about her relationship with Charles and left a chilling message on her answer phone which said: "I've sent someone to kill you".
The Blind Date presenter said: "But it's like she's embraced it, that's it, she's really embraced it and gone for it and all her charity work".
The portrait, showing the heir to the British throne and his wife in the morning room of their London home, Clarence House, was taken by photographer Mario Testino, known for his glamorous portraits of the rich and famous.
In the image, the Duchess stands next to her husband, the Prince of Wales as they wear matching navy blazers.
Her trademark hair has been freshly coiffed in a slightly softer style than usual by her personal hairdresser, Hugh Green. He took Prince William and the Duchess of Cambridge's official engagement photos in 2010, and has also taken official photographs of both Prince George and Princess Charlotte.
She also appears to have been given warmer highlights by her personable colourist, Jo Hansford, whom she still likes to visit in person at her Mayfair salon for an all-over colour and gossip.
In a statement, the Peruvian said that when he first met Camilla for her 2006 portrait, he "discovered a kind and lovely person with a wonderful sense of humor".
'The image is one of several that was taken that day.
Later on Saturday, a birthday party for the Duchess will be staged at the Prince's Highgrove home in Gloucestershire, with a large gathering expected at the private event. Although these were not shot as official birthday portraits Their Royal Highnesses liked them very much and felt it would be nice to share one of them to mark the day'.
Over the years, friends of Camilla have spoken of her dry wit, her love of her family and her devotion to husband Charles who she married in 2005.