Princess Kate looks just like Prince Louis as a baby in adorable new throwback photo

Like mother, like son!

Princess Kate left royal fans doing a double take over the weekend after she shared a tender childhood photo of herself as a baby with her dad, Michael Middleton.

The royal mother posted the photo to social media to launch the Royal Foundation Centre for Early Childhood's Shaping Us campaign, which intends to increase public awareness of the significance of a child's first five years of life.

"Faces are a baby's best toy," she captioned the sweet snapshot of herself, which was taken by her mother, Carole Middleton.

"On Tuesday we launched #ShapingUs to raise awareness of the vital role our early years play in shaping the rest of our lives.

This weekend, we’d love for you all to spend time with your friends, families, colleagues and communities talking about your early childhoods and how they’ve shaped your lives," she continued, adding that she hoped her followers would join in by "sharing a picture of yourselves before your fifth birthday to help with those conversations and to share some smiles and memories too."

But many fans were quick to share a similar thought; that the Princess of Wales and Prince William's youngest son, Prince Louis, bears a striking resemblance to his mum.

One fan gushed: "Legit thought that WAS Louis! I couldn’t understand the outfit. Took a min to realise it was C!"

Another wrote: "It took me a few minutes to figure out that was Catherine not Louis!"

Such a sweet photo!