Adorable new Prince George photos mark royal's 6th birthday

SEE: Will and Kate’s 2018 Christmas Card

LONDON — Happy birthday, Prince George!

The eldest child of Britain's Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, turned 6 on Monday.

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Kensington Palace tweeted new photos of the adorable royal Sunday. The duchess, formerly known as Kate Middleton, snapped two of the pictures recently at the palace in London and a third while on vacation, according to the royal family.

George has two younger siblings, Princess Charlotte, 4, and Prince Louis, 1.