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LONDON – The youngest child of Britain’s Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, turned 3 on Friday.

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Kensington Palace tweeted a new photo of the adorable royal Thursday. The duchess, formerly known as Kate Middleton, snapped the image, which shows Louis leaving for his first day of nursery school, the palace said.

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Other members of the royal family also took to social media to share well-wishes for the prince.

“A very happy birthday to Prince Louis, who turns three today,” Prince Charles and wife Camilla, Duchess of Cornwall, tweeted Friday.

Louis has two older siblings, Princess Charlotte, who turns 6 on May 2, and Prince George, who is 7.