Happy birthday, Princess Charlotte!

The middle child of Britain's Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, turned 4 on Thursday.

Kensington Palace tweeted new photos of the adorable royal Wednesday. The duchess, formerly known as Kate Middleton, snapped the pictures last month at the palace in London and the family's home in Norfolk.

>> See the photos here

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The post came just days after Charlotte's baby brother, Prince Louis, celebrated his first birthday and her great-grandmother, Queen Elizabeth II, marked her 93rd. Charlotte's uncle, Prince Harry, Duke of Sussex, and his wife, Duchess Meghan, formerly known as Meghan Markle, also are expecting a baby in the coming days.