It seems like only yesterday that the Duke and Duchess of Cambridge proudly displayed their first-born on the steps of the Lindo Wing at St Mary's Hospital, Paddington.
The following year the third in line to the throne, then ten months, was dubbed 'the Republican slayer' when they took him on tour to Australia and New Zealand and he won the nation over with his chubby little legs and characteristic pout.
Now, as he and his classmates at Thomas's Battersea, the private prep school he attends in London, prepare to move up and become 'leaders' of the Lower School, his mother Kate, 37, has proudly offered a glimpse of how big her 'little Georgie' has become.
All three pictures released yesterday by Kensington Palace to mark the future king's sixth birthday today were taken by the duchess, a talented amateur photographer.
Gap-toothed grin! Playful George can be seen belly laughing in official portraits released by Kensington Palace ahead of his sixth birthday today
Little lion! The birthday boy shows off his cheeky smile and missing baby teeth in the photographs - and hints at his love of sports by wearing an English football shirt
In another picture taken during a family vacation at an undisclosed location, George appears more reserved and can be seen wearing a green polo top and nautical shorts as he poses for the camera
'The Duke and Duchess of Cambridge are very pleased to share three new photographs of Prince George to mark His Royal Highness's sixth birthday,' Kensington Palace said.
The prince has clearly inherited his father's love for football - the Duke of Cambridge is president of the FA and an Aston Villa fan - as evidenced in his white England team top in two of the new portraits.
The Mail understands that while those pictures were taken at Kensington Palace during the England 'lionesses' recent World Cup campaign, the top is one of his favourite items of clothing and George can frequently be seen haring around Kensington Palace with a football at his feet.
In the snap, the future king laughs as he lies playfully in the garden of their home at Kensington Palace - clad in the white England football home shirt.
Pictured, left, Prince William when he was George's age, with brother Harry and mother Diana. Right, Kate Middleton when she was a child
A second photograph again shows George in the shirt, grinning gleefully at the camera, while a third picture shows the young prince on a family holiday just a few days ago.
Royal official have not confirmed where the family are, although reports suggest they may have flown with Kate's family to the exclusive Caribbean island of Mustique.
But George is clearly enjoying soaking up the sun, wearing a pair of blue and white stripped swimming shorts over which Kate has quickly thrown a favoured green polo shirt - a snip from High Street store H&M at just £6.
Prince George Alexander Louis of Cambridge was born in the private Lindo Wing of St Mary's Hospital, Paddington, at 4.24pm on July 22 2013, weighing 8lb 6oz.
He made his public debut in front of the world's media on the hospital steps one day later, wrapped in a white merino wool shawl, cradled in his proud parents' arms.
When George was born, Kate Middleton followed in Princess Diana's footsteps and stood on the steps of the Lindo Wing of St Mary hospital for the first time - which she has continued to do for the birth of all her children. Pictured, the Duke and Duchess of Cambridge with newborn Prince George on 23 July 2013
Striped delight! Prince George photographed walking about in official pictures released back in 2014 to mark the young royal's first birthday (left)
Prince George - the eldest son of the Duke and Duchess of Cambridge - donned a baby blue ensemble as he was pictured in his father Prince William's arms during his second Trooping the Colour, on the balcony of Buckingham Palace, on 13 June 2015
George put on a serious display when he attended the wedding of Princess Eugenie to Jack Brooksbank at St George's Chapel on October 12, 2018 in Windsor
George the joker! The young Prince was pictured playing tricks behind Mia Grace Tindall at St George Chapel, in Windsor, on the day of Princess Eugenie's wedding on October 12 2018
Cheeky page boy! The birthday boy couldn't contain his excitement during Princess Eugenie's wedding in Windsor on 12 October 2018 - and was pictured with his hand over his mouth in shock
A great-grandchild to the Queen, he will be the 43rd monarch since William the Conqueror obtained the crown of England if, as expected, he follows the reigns of his grandfather, the Prince of Wales, and then his father, William.
In public George can sometimes come across as a serious little boy, who has already developed a clear wariness of the cameras that are part and parcel of his royal life.
But friends say that while he is definitely more cautious and sensitive in nature than his younger sister, Princess Charlotte, four, the little prince is actually a