Eagle-eyed royal fans like to point out how similar the younger generation of princes and princesses look to their older relatives in the British royal family.
Today, for example, enthusiasts went wild after the Princess of Wales shared an unpublished childhood photograph of herself enjoying a family Christmas in 1983 – with many calling Prince Louis her “twin”.
Kate, 41, shared the picture from the Middleton family photo album on Instagram this afternoon to promote their carol service, which will air on ITV at 7.45pm on Christmas Eve.
The picture was taken as the mother of three was just a month away from her second birthday. It shows the princess in a red and blue striped dress, a dark blue cardigan and a colorful pearl necklace.
She can be seen transfixed by something in the distance as she sits at the table decorated with festive tea lights.
Today royal fans were left abuzz after the Princess of Wales shared a previously unseen childhood photo of herself enjoying a family Christmas in 1983 (pictured left) – with many taking Prince Louis (pictured right at the King's coronation) as hers called “twin”.
The picture delighted the royal couple's followers – it drew many comparisons between Kate and Prince Louis.
However, this is not the first time a young king has been compared to his older relative. Fans regularly note Prince George's resemblance to his father Prince William, while Princess Charlotte is compared to her late grandmother Princess Diana.
Here, FEMAIL takes a look at who fans most often say Princes George, Louis and Archie and Princesses Charlotte and Lilibet look like…
Earlier this month, royal fans raved about Prince George's resemblance to his father as he attended the “Together At Christmas” song service at Westminster Abbey. George is pictured on the right, on the left: William at the age of 10
Royal fans noticed how much Princess Charlotte looked like her late grandmother Princess Diana at the royal coronation in May (left: Diana in 1970 and right: Charlotte at the coronation).
Royal fans also previously pointed out the striking similarities between Prince Harry's daughter Princess Lilibet and her big cousin Princess Eugenie after their picture was released to the public to mark her first birthday
Like father, like son! After the Duke and Duchess of Sussex shared a family photo to mark the holidays, fans raved about the resemblance between Archie and his father Prince Harry, who was left behind at Highgrove in 1986 when he was four years old