Unlike the christening, which The Queen didn't attend, Her Majesty led the pack today, followed by Prince Charles and Camilla, William and Kate, and Harry and Meghan, as well as more of the royal lot.
A day crowded with royal ceremony began with a special service in Westminster Abbey, followed by a parade in The Mall, the traditional roaring fly past over the palace, plus receptions later.
He is also one of Queen Elizabeth II's seven great-grandchildren.
However, on exiting the chapel with her family - today marked the first time the young royals have been seen as a family of five - Charlotte couldn't help but give her adorable signature wave to her adoring public.
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However, the olive colour scheme and designer - reported as Ralph Lauren by fashion-tracking site Meghan's Mirror - are new for her since she became a royal. Charles, too, served as an RAF pilot.
Unlike her previous christening looks, Kate slipped into a dress this time, featuring embellished shoulders and a v neckline.
The duchess accessorised with nude heels, a silvery fascinator with a bow and floral accents, and the prestigious Air Cadets Dacre brooch, which is the highest award a female cadet can receive. The stunning Alexander McQueen skirt suit boasted a lovely ruffle down the front of the jacket and around the waist.
But the Queen and her husband, Prince Philip, were absent from the event, though the palace has said it wasn't for health reasons.
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In the retro snaps, Kate can be seen wearing a gorgeous, white flowing christening gown, as various members of her family pose for photos.
The anniversary brought the royal fab four together again.
The Duke of Cambridge arrived in his No 1 uniform of the Royal Air Force, as well as his RAF wings in recognition that he is a qualified RAF pilot.
A century later, the RAF is engaged in 13 missions across 26 countries and is heavily committed on operations both at home and overseas, according to Buckingham Palace.
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