The Princess of Wales turned 42 today. King Charles has wished his daughter-in-law, the Princess of Wales, a happy 42nd birthday. The King shared a never-before-seen photo of Princess of Wales. Taken by Chris Jackson, the photo shows the Princess of Wales with King Charles in a behind-the-scenes moment at last year's coronation. The Princess, (born Catherine Elizabeth Middleton, 9 January 1982), is a member of the British royal family.