Someone looks very happy to be turning 5.

Kensington Palace shared an adorable photo of a smiling Prince George, the oldest child of Britain's Prince William and Catherine, Duchess of Cambridge, on Saturday, one day before the pint-sized royal's birthday.

"The Duke and Duchess of Cambridge are very pleased to share a new photograph of Prince George to mark his fifth birthday – thank you everyone for your lovely messages," the palace tweeted along with the photo, taken by Matt Porteous.

>> See the photo here

The tweet quickly racked up 57,000 likes and 6,500 shares in 10 hours.

Take a look at his previous birthday portraits below:

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