In this photo taken on Monday, July 9, 2018, Britain's Prince George poses for a picture following the christening of his brother Prince Louis, at Clarence House in London. Britain's Prince William and Kate, Duchess of Cambridge have released a photo of Prince George to mark his fifth birthday on Sunday, July 22. (Matt Porteous via AP)
Photo: Matt Porteous/AP
Photo: Matt Porteous/AP

Happy 5th birthday, Prince George! Kate Middleton, Prince William share sweet photo of oldest son

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.

>> Prince Louis' christening portraits revealed: Kate Middleton, royal family stun in new photos

"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.

>> PHOTOS: Prince Louis christened

Take a look at his previous birthday portraits below:

>> Read more trending news 

The Duke and Duchess of Cambridge are delighted to share four new photographs of Prince George to mark his third...

Posted by The Royal Family on Friday, July 22, 2016
Prince Louis' Christening Portraits Revealed

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