Diana's brother shares old family pic and fans all say it looks just like Harry

Princess Diana's younger brother Charles, 9th Earl Spencer, has stunned royal fans after sharing an old family picture online.

The British peer and author posted a black and white image of his great uncles Cecil and George Spencer in the early 1900s. T

he two boys can be seen setting off on horseback together at Althorp House in West Northamptonshire, both wearing the same equestrian-style outfit.

The post, which has received thousands of likes and a slew of comments, soon got everyone saying the same thing.

Eagle-eyed royal fans were quick to notice that one of the boys shared a rather striking resemblance to Charles' nephew, Prince Harry, when he was a child.

A number of royal fans said the boy pictured on the right looked like a young Prince Harry (instagram.com/charles.earl.spencer)

Can you see the resemblance? Have your say in the comments section below

"Wow, your uncle on the right looks like Prince Harry," one user wrote.

Another added: "The little chap on the right looks like a young Prince Harry."

A third commented: "I can see the family resemblance, especially the young lad on the right. The power of the historical photograph."

Some fans also said one of the boys looked like Prince Louis of Cambridge - Prince Harry's nephew.

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Royal fans also commented on how much Lilibet looks like her dad, Prince Harry (@scobie/Twitter)

Prince Harry and Meghan (Getty Images for the Invictus Games Foundation)

Earlier this week, royal fans also pointed out Lilibet's uncanny resemblance to Harry after a picture was released at her first birthday picnic at Frogmore Cottage.

The Duke and Duchess of Sussex's daughter, also known as Lilli, was snapped smiling in a pale blue frock and white bow in her hair.

The adorable pic was taken by photographer and friend of Meghan and Harry, Misan Harriman.

Prince Harry's uncle posted the old family snap on Instagram, attracting a slew of royal fans (PA)

The family friend later shared a black and white image on Twitter of Meghan holding Lilibet alongside the words: "It was such a privilege to celebrate the 1st birthday of Lilibet with my family and hers! Joy and face painting all around."

Social media users quickly noted the striking similarities between Lilibet and her dad - comparing the image to that of Harry as a one-year-old and saying the royal has "cloned himself".

"If she isn't the spitting image of her dad, red hair and all," one user wrote.

Another added: "Lilibet Diana looks like her papa, Prince Harry".