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Prince Charles, Camilla Duchess of Cornwall

Courtesy Clarence House

Weeks before they are set to welcome a new grandchild, the second royal baby, Prince Charles and Camilla are celebrating another happy occasion—their 10th anniversary.

On Thursday, Clarence House, the couple's royal residence in London, has released a sweet photo of the pair. The picture was taken in January and shows the Prince of Wales and Duchess of Cornwall taking a romantic stroll through the grounds of their Balmoral estate in Birkhall, Scotland and leaning on what appears to be a fence of a rustic bridge, amid a backdrop of bare trees.

Charles, the 66-year-old heir to the U.K. throne, is bundled up in a plaid jacket and matching flat cap and wears green gloves. He stares lovingly at his smiling wife, 67, who sports a gray jacket and fur-trimmed hat and blue gloves.

Charles and Camilla, who became his second wife more than six years after the 1997 death of his ex, Princess Dianawed on April 9, 2005 in front of family and friends at the town hall in Windsor, located about 20 miles west of London, near Windsor Castle. The royal family, led by reigning constitutional monarch Queen Elizabeth II, 88, comes from the House of Windsor.

Prince Charles, Camilla Duchess of Cornwall

Julian Parker/UK Press via Getty Images

And Charles and Camilla were also mad for plaid as they celebrated their first wedding anniversary in 2006, sporting a matching skirt and traditional Scottish Highland kilt as they attended a service at a church in the Scottish village of Crathie.

Prince Charles, Camilla Duchess of Cornwall

Mark Cuthbert/UK Press via Getty Images

Their 2005 wedding was a modest affair compared to the lavish, televised nuptials of the prince and Diana, parents of Prince William 32, and Prince Harry, 30. The couple separated in 1992 and divorced in 1996. The princess, the U.K.'s most beloved royal at the time, died in a car crash at age 36 in France a year later.

Charles and Camilla, who have known each other since the '70s, went public with their relationship in 1999. After they wed, she was given the title the Duchess of Cornwall rather than the Princess of Wales, which was Diana's former title.

Camilla has two children and five grandchildren from her previous marriage. William's wife, Kate Middleton, 33, aka Catherine, Duchess of Cambridge, is due later this month to give both to their second baby, who will be a sister or brother to Prince George, 1.

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