Royal fans have watched the future King grow into a young man, and have been mesmerised by just how much he is like his fellow future King father, the Prince of Wales.
So, in honour of his exciting milestone, we thought we would take a look back at all the regal photos where George was the image of his royal father, on the eve of his 13th birthday.
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George looked so much like his royal father just weeks ago
One of the most lookalike moments of William and his eldest son was just three weeks ago when George made a poignant visit to RAF Coningsby in Lincolnshire, appearing in a special video to mark Armed Forces Day.
For the occasion, which he attended with his mother, the Princess of Wales, George wore a navy blue suit jacket, under which he wore a blue collared shirt as he boarded an aircraft.
Both of the future kings were decked out in navy suits, braided belts and brown suede shoes for the occasion, and looked equally as dapper as one another. The pair even co-ordinated with their buttons, having the top two undone for the public occasion.
Prince William and Prince George wore the same outfit as infants - and it's one of our favourites
It would be remiss of us not to include a number of throwback photos in this round-up as there are so many sweet examples of the father-son duo looking like twins in photographs from their infant years.
One of our favourites saw George rock fabulous red shorts to attend his little sister, Princess Charlotte's christening back in 2015.
The young Prince looked nothing short of precious in the outfit, which was also comprised of a beautiful embroidered shirt. The adorable outfit was worn by a tiny Prince William in 1984 when he made a very special visit to see his baby brother, Prince Harry.
In the photo, George wore a chequered blue and white shirt, with teal jeans and boots – similar to outfits we've seen on his father, William - with a huge smile on his face. "He looks so grown up now and so much like his dad. Happy 10th birthday, Prince George! I wish you all the best, and I hope you will have a great day and a wonderful new year! We all love you," one royal fan wrote in the comments.
A second added: "Happy Birthday Prince George. You're growing so fast, and you look like your dad and your grandmother."
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