The Duke and Duchess of Cambridge were "delighted" to share the photograph taken by royal photographer Chris Jackson, Kensington Palace said.
He tweeted this evening: "I'm honoured that the Duke and Duchess of Cambridge have chosen to release this portrait I took to celebrate Prince George's 4th Birthday".
As Kate, William, Prince George, and Charlotte walked on the runway before boarding their flight to the United Kingdom, the little princess went to grab a bunch of papers from her mom's hand, but the Duchess quickly pulled them away.
The third-in-line to the throne is wearing a blue and white striped shirt as he smiles into the camera lens. The photograph was taken at Kensington Palace in June, according to ABC News.
Spain vows to cut off funds to Catalonia over independence vote
Puigdemont has said that if the "Yes" vote wins in October, the regional government will declare independence within 48 hours. But less than three months before the vote, support for secession from Spain is waning.
Later, the royal couple will travel to one of Hamburg's newest landmarks, the Elbphilharmonie concert hall.
Prince George tried on a pilot's helmet while Princess Charlotte played with buttons in the cockpit.
Tens of thousands of people turned out to see the royal family, with Prince George and Princess Charlotte an important part of the visit.
By contrast, Princess Charlotte, who had been on her best behaviour for the previous four days, threw a little tantrum and dropped to the ground at the airport as the family prepared to fly back to the UK.
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