The photo comes a few days after the Duke and Duchess, Prince William and Kate, shared photographs from Louis' christening, including a candid moment of their youngest child laughing in his mother's arms. Kensington Palace says it was the Duke and Duchess of Cambridge who chose to share the photo.
To celebrate his upcoming birthday this Sunday - seriously, how is Prince George already turning five? - we've collected his most adorable moments to date.
Putin summit: USA president under fire over poll meddling comments
Trump told reporters during a breakfast on Monday with Finland's president that he thought the summit would go "fine". According to Trump, he was "Very strong on the fact that we can't have meddling, we can't have any of that".
George Alexander Louis of Cambridge was born in the private Lindo Wing at St Mary's Hospital, Paddington, at 4.24pm on 22 July 2013, weighing 8lb 6oz.
A very happy birthday to you, Prince George!
George stole the show and even visited the Taronga Zoo in Sydney where he famously threw away a koala teddy.
The Cambridges are believed to be on their first holiday as a family of five.
The past year has been a formative one for George as the family reportedly moved back to London from their busy life at Anmer Hall, on the Queen's Sandringham Estate in Norfolk, and started school.