Prince William and Princess Kate Middleton marked firstborn son Prince George's 12th birthday by sharing a new portrait of the soon-to-be teenager. In the pic, a smiling George can be seen leaning against a fence in the countryside. He is clad in an outdoorsy gilet over a checkered shirt with the sleeves rolled up. "Happy 12th Birthday to Prince George! ," the official Kensington Palace X account wrote alongside the picture on Tuesday, July 22.