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Something in the heir! Adorable new photo of Prince George (plus the Queen, Prince Charles and Prince William)

Prince George is appearing on his first postage stamp, joining three older generations of royalty to celebrate Queen Elizabeth II's 90th birthday.
/ Source: TODAY

A new group of stamps are being released to celebrate Queen Elizabeth's 90th birthday, but it's the pint-sized future king perched on foam blocks who steals the show with his adorable grin.

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Prince George, 2, is making his first appearance on a royal stamp in a picture showing four generations of royalty, including his beloved "Gan Gan,'' better known as the Queen.

Prince Charles, Queen Elizabeth II, Prince George and Prince William pose during a Royal Mail photoshoot for a stamp sheet to mark the 90th birthday of Queen Elizabeth II in the White Drawing Room at Buckingham Palace in the summer of 2015 in London.Getty Images

Holding the hand of his father, Prince William, George, who is third in line to the British throne, beams while joined by his great-grandmother as well as his grandfather, Prince Charles, in a picture featuring all three of the Queen's direct heirs. George stood on the blocks to make him the exact height of the Queen in order to make the photo work, photographer Ranald Mackechnie told The Telegraph.

Prince George hopped up on some foam blocks to help round out the photo featuring Queen Elizabeth II and her three direct heirs to the throne.RANALD MACKECHNIE / ROYAL MAIL / / EPA

“He was absolutely charming, as you can see from the picture,'' Mackechnie said. "You only have a short window of opportunity with small children, but Prince George was on good form and everyone seemed to enjoy seeing him enjoy the day."

The pictures were taken in the summer of 2015 in the white drawing room at Buckingham Palace. Six stamps will be issued on Thursday to celebrate the 90th birthday of the Queen, who has been on the throne since 1952.

There will be six stamps issued to mark the 90th birthday of Queen Elizabeth II.Getty Images

Prince George attends his first day of nursery school: See the photos!

“Because the picture was going to be turned into stamps on a sheet, each person’s head had to be in exactly the right place,'' Mackechnie told The Telegraph. A millimeter the wrong way on the final stamp sheet would have made the perforations too close together, so I had to make sure everyone was spaced the right distance apart.”

Follow writer Scott Stump on Twitter.