April 29 (UPI) -- British royals Prince William and Kate Middleton are celebrating their 15th wedding anniversary.
William, 43, and Middleton, 44, formally known as Catherine, Princess of Wales, marked the occasion Wednesday by sharing a new family photo.
The image shows the couple smiling as they lie on grass with their three children, Prince George, 12, Princess Charlotte, 10, and Prince Louis, 8, and their two dogs.
"Celebrating 15 years of marriage," the caption reads.
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