Chatting happily and smiling during a peaceful walk in the grounds of their Scottish country home, they could be any long-married couple enjoying a stroll. But this is the Prince of Wales and the Duchess of Cornwall and the intimate shot marks not 40 years of marriage but 10. The couple, who married a decade ago  at the Windsor Guildhall, are spending their anniversary privately at Birkhall in Deeside. Scroll down for video . Portrait of a happy marriage: Charles and Camilla in the new photo released to mark their 10th anniversary . Big day: The Prince of Wales and the Duchess of Cornwall on their wedding day a decade ago . Birkhall, which sits on the Queen's Balmoral estate, was the location for their honeymoon and was also the venue for their first anniversary celebrations. The new image, which is the work of top photographer Oliver Dann, was taken in the run-up to last month's visit to the U.S but was released by Clarence House today. In it, Charles wears a country coat made from Inveravon Estate Tweed and a matching hat by Lock & Co, while Camilla sports a hat by the same firm and a coat by Moncler. Charles and Camilla finally married following a relationship spanning 35 years in a relatively quiet civil ceremony at the Windsor Guildhall on the 9th April 2005. Despite fears that the couple would be booed - Camilla was reportedly so nervous that she had to be dragged out of bed - the ceremony went off without a hitch. Since then, the Duchess of Cornwall as she is now known, has become an integral part of the Royal Family - and would be cheerfully accepted as Charles' queen by 50 per cent of Britons. That marks a significant turnaround from the Duchess' earliest days as a royal, with Camilla following Charles' lead and often appearing nervous in front of photographers. But her enthusiastic championing of causes ranging from osteoporosis to sexual abuse survivors has not gone unnoticed and her relationship with the Queen is now said to be close. 'Her role has changed dramatically,' explains royal biographer Penny Junor. 'One minute she was a mistress and then she was an HRH. 'When she first married Charles she was very nervous. On her wedding day, she was terrified. She had no idea if she would be booed in the street. 'In fact, there was a very warm reception. The streets were packed in Windsor. She has slowly gained courage and confidence. Initially she was very much in the background, supporting the Prince and she still does that. 'She's never had any ambition for herself. She didn't want to be a princess or a duchess. She just happened to love a man who was the Prince of Wales and look at the fuss that caused. She doesn't want to be a star or be curtseyed to. Happy: The pair are all smiles as they arrive at the British ambassador's residence in Washington last month . Cheers! Charles and Camilla pictured enjoying a dram during a visit to Birkhall last summer . 'But slowly, slowly she has become much more involved in royal life and taken on an awful lot of charitable causes.' The Duchess is now patron or president of 85 charities, joint patron or president with the Prince of four, and is affiliated to a number of other organisations. Ms Junor added: 'It's really, really valued by those charities. She works extremely hard. Having been a woman who up to her mid-50s had been a wife and a mother and a country woman who enjoyed horses and dogs, she's completely reinvented herself and become an ambassador for the country.' In 2013, Camilla made her first ever appearance at the State Opening of Parliament wearing a glamorous champagne silk and lace Bruce Oldfield gown. The Duchess, whose presence was seen as a boost for Charles, topped that with the Queen Mother's priceless Boucheron tiara and the Dame Grand Cross of the Victoria Order sash. She returned for the 2014 state opening as well and is expected to return once again for this year's event. Close: Prince William and the Duchess of Cornwall share a joke during last September's Invictus Games . Support: The Queen shares a carriage with Camilla during the Diamond Jubilee celebrations in 2012 . One is amused: Camilla laughs with Prince Harry and the Duchess of Cornwall during the Diamond Jubilee . Similarly styled: The Duchess' dress sense has also evolved over the last 10 years and is much like her daughter-in-law's . The Duchess has also carried out joint engagements with the Queen and in November hosted a reception on behalf of the monarch for the Commonwealth Essay competition. During the Diamond Jubilee in 2012, the Queen and Camilla sat side-by-side in the ornate 1902 state landau - a step that would have been inconceivable a decade earlier. The Duke of Edinburgh had fallen ill and the Prince of Wales and Camilla stepped in to ride with the monarch in the carriage procession back to Buckingham Palace. But it was Camilla, not Charles who was seated next to the Jubilee Queen. She was present too on stage, standing next to the sovereign, as Charles paid tribute to his mother at the finale of a pop concert in front of the Palace. During the Golden Jubilee concert in 2002, prior to her marriage to the Prince, Camilla was seated several rows behind Charles. On Charles and Camilla's seventh wedding anniversary in 2012, the Queen made the Duchess a Dame Grand Cross of the Royal Victorian Order (GCVO) - a personal seal of approval from the monarch. 'I don't think that the Queen has ever had any personal animosity to Camilla. In the Eighties and Nineties when Charles and Diana were at each other's throats, Camilla was seen to be the cause and it threatened to destabilise the monarchy,' says Ms Junor. 'The Queen has always been fond of Camilla. She knew her for years and years, long before she was involved in the break up of the marriage.' She added: 'The Queen reacts to public opinion. Once the public were going to accept Camilla, the Queen was able to accept her publicly. 'They've got a great deal in common. They're mad about horses, dogs. They're country women.' When Camilla married Charles, aides insisted she did not want to be known as queen when the Prince acceded to the throne but intended to be known as princess consort instead. But according to some legal experts, unless there is change in the law, Camilla will technically become queen when Charles is king - no matter what she decides to call herself. At the time of her engagement to the Prince in 2005, a poll showed that only seven per cent of people believed Camilla should one day be queen. Happily married: Charles has cut an increasingly relaxed figure since his marriage . Close: The Duchess has always known how to make Charles laugh and he 'adores her' in return . Royal duties: With half of Britons supporting the idea, it is increasingly likely that Camilla will become queen . A decade later, half of all Britons say she should become queen when Charles takes the throne according to a poll by YouGov. A third think she should be given a lesser title out of sensitivity to Diana, Princess of Wales and 16 per cent were unsure. When the Prince was put on the spot and asked if Camilla would be his queen in an interview in November 2010, he replied: 'That's, that's, we'll see, won't we? That could be.' 'I think there's still a hard core of people out there who want nothing to do with Camilla and think she's the devil incarnate but the vast majority think she's a good thing,' adds Ms Junor. 'She is familiar now as any member of the Royal Family. She's a fixture. It would be very strange if she were not called queen. 'I think she will be embraced and think the public will have no problem with it whatsoever. Charles is hugely proud of her and she's so important to him. 'He adores her. He wants her by his side - that's an absolute given.' Born Camilla Rosemary Shand on the 17th July 1947, the Duchess of Cornwall's 67 years have undoubtedly been interesting ones. The daughter of Major Bruce Middleton Hope Shand and his wife Rosalind, the Duchess was born in London but spent much of her childhood in Sussex along with her siblings, Annabel and Mark. According to her biographer Giles Brandreth, her upbringing, although not royal, was certainly a grand one. 'Camilla is often described as having had an "Enid Blyton sort of Childhood",' he writes. 'In fact, it was much grander than that. 'The Shands had position and they had help – help in the house, help in the garden, help with children. 'They were gentry. They opened their garden for the local Conservative Party Association summer fête. Enough said.' After a stint at a Swiss finishing school, Camilla burst onto the London social scene as a debutante on the 25th March 1965. But it wasn't all fun, with the future Duchess of Cornwall working as a secretary for a succession of London firms to pay for her Belgravia flat, which she shared with Lady Moyra Campbell. In the late 1960s, Camilla met the man who was to become her first husband, cavalry officer Andrew Parker-Bowles, with the couple dating off and on for several years - with Mr Parker-Bowles striking up a relationship with Princess Anne at one point. Camilla, meanwhile, had struck up a relationship with Prince Charles, who was first introduced to her sometime in 1971. When the couple split following an overseas posting for Charles in 1973, Camilla reconciled with Parker-Bowles and the couple announced their engagement and married the same year. Two children followed. Tom in 1974 and Laura in 1978. But it was her continuing relationship with Prince Charles that would come to define her, with the former couple remaining close friends even after both had married other people. In 1992, claims that the two had remained an item throughout both marriages emerged when Diana: Her True Story was published, followed, a year later by the 'Camillagate' scandal. By 1995, both marriages had come to an end and Charles and Camilla were unofficially back together, with the future Duchess often seen attending events with the prince. Royal acceptance soon followed with the Queen making Camilla part of the Golden Jubilee celebrations in 2002. A year later, the Duchess moved into Clarence House and on the 10th February 2005, Charles and Camilla's engagement was announced. The couple married just under two months later in Windsor, with Camilla taking the title of the Duchess of Cornwall.
Clarence House has released a new photo to mark 10th anniversary .
The snap was taken last month at the couple's Scottish home, Birkhall .
Camilla Parker-Bowles became the Duchess of Cornwall a decade ago .
Since then, she has become an increasingly popular figure .
Camilla also enjoys a close relationship with the Queen and her stepsons .