Is this Charlotte's doppelganger?

It turns out young Princess Charlotte’s looks really do run in the family.

Royal fans were quick to spot similarities between the three-year-old and Princess Diana’s niece, Lady Kitty Spencer.

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The revelation came after Lady Kitty shared an adorable throwback photo of herself on her first day of school, making her just a couple years older of what Princess Charlotte is in the snap.

"First day of school #tbt," the 27-year-old wrote alongside the photo, which was posted to Instagram.

Princess Charlotte. Photo / Getty

"Spitting image of Charlotte," one fan wrote in the comments, while another added "Princess Charlotte has the Spencer genes. You look so similar."

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"Now we know how amazingly beautiful Charlotte will be in the future," other royal fan wrote.

Lady Kitty Spencer. Photo / Getty

We can definitely see the similarities!

Kitty isn’t the only family member Charlotte has been compared to.

Prince William and Prince Harry in 1986. Photo / Getty

Over the past few years, Charlotte has shown traits similar to her great-grandmother Her Majesty The Queen, and it also appears Charlotte has the same cheeky grin her father, Prince William had when he was younger too.