"Doing this latest assignment to celebrate Her Royal Highness's 70th birthday is a true honour", he added. In a statement, the photographer said he was "honored" to capture the couple "on this very important date", noting that after he first photographed her in 2006 he "discovered a kind and handsome person with a wonderful sense of humor".
The Duchess reaches her milestone birthday in good form.
Now as she approaches her seventh decade, she continues to be adept at switching from glamorous high profile royal occasions, like the recent state banquet for the King of Spain, and kicking off her high heels for her much loved wellies.More news: Britain's royals William and Kate to visit Poland on Monday
It is thought family members - from her son Tom Parker Bowles and daughter Laura Lopes to the Duke of Cambridge and Prince Harry, who are playing polo in Gloucestershire - are likely to be among the guests.
Dame Esther said: "The Duchess has an understanding and empathy for older people who are so often forgotten and undervalued in today's busy world".
Camilla celebrated becoming a septuagenarian with two parties over the last week and held a garden party for her staff and her many charities on Thursday at Clarence House in London.More news: China June coal output rises as summer power demand heats up
Are Prince William and Kate Middleton invited to Camilla Parker-Bowles star-studded 70th birthday bash? 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'. Camilla has always had soft spot for animals and their welfare.
The royal couple's affair became public in 1993 after a transcript of a 1989 intimate phone conversation between the two was revealed.More news: Dollar Drives to Ten-Month Lows as US Data Continues to Disappoint
The Duchess revealed at a child literacy event that Prince Charles would read to his five step-grandchildren whenever they were together and it seems like there's a future in kids' party entertainment if the whole royalty thing doesn't work out. With Queen Elizabeth's approval in February 2005, Charles announced his wedding to Camilla on April 9 at Windsor Castle.