This party was the second held in celebration of the Duchess of Cornwall's birthday in a matter of days.
The Queen and Prince Philip marked the 70th anniversary of their engagement, Philip fulfilled his final ceremonial duty, and now the Duchess of Cornwall has celebrated her 70th birthday.
The Peruvian photographer took the shot in Clarence House in May.
Among his best-known pictures are a series of informal portraits of the late Princess Diana taken months before her death in 1997.
The Peruvian photographer said that when he first met Camilla, more than a decade ago, he "discovered a kind and handsome person with a wonderful sense of humour".
"Doing this latest assignment to celebrate Her Royal Highness's 70th birthday is a true honour", he added.
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Her step-sons Prince William and Prince Harry attended along with her own children Tom Parker Bowles and Laura Lopes.
Camilla's relationship with Charles has attracted worldwide scrutiny, but the pair finally Wednesday in 2005 after years of controversy at Windsor Guildhall.
Prince Charles and Camilla were officially photographed in public for the first time in 1999 after a party at The Ritz hotel.
In the soft-focus photograph, Camilla looks relaxed and happy, with her soft blonde hair do and natural make-up reflecting her low-key approach to style.
It is exactly this strategy, creating bespoke, stylish pieces in an age of anonymous fast fashion trends, that has propelled Valentine's Marylebone atelier to reach a milestone 30 years in business, as well as attracting a loyal base of clients- one of the most notable being Camilla, Duchess of Cornwall. They're outside in the garden.
Camilla is said to not have been angry towards Diana as some might expect, and was instead sympathetic towards her.
Obviously there are people who will never like Camilla as they see her as the person who broke up the marriage. But she also couldn't forgive the princess for deliberately saying things to "damage Charles".