According to insiders, the youngest son of Prince William and Catherine, Princess of Wales is about to move on from a long-standing royal custom that has been followed for generations.

Louis, currently fourth in line to the throne, celebrates his birthday on 23 April. He is three years younger than his sister Princess Charlotte, who turns 11 soon, and five years younger than his brother Prince George.

To mark the occasion, Kensington Palace released a new official portrait, continuing the usual tradition of sharing a photo for royal birthdays. In the image, Louis is seen wearing a navy knitted quarter-zip jumper with orange details, smiling with a noticeable gap in his teeth as his hair is tousled by the wind.

While the photo doesn’t show what he’s wearing below the waist, there’s speculation that this could be the moment he swaps his usual shorts for full-length trousers.