The Princess of Wales beamed as she appeared with her children for Trooping the Colour - complete with Prince Louis dancing along to the bagpipes.
It was Kate's first public appearance since her cancer diagnosis was announced, and the crowds of people lining The Mall in London were doubtlessly there in large part to catch a glimpse of the princess.
She and her three children were cheered by crowds as they ventured out from Buckingham Palace in a carriage procession, while the Prince of Wales accompanied them on horseback.
When the royal carriages came to a stop it was Prince Louis, her youngest son, who was first to jump down followed by Prince George and his sister Princess Charlotte.
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Tap hereWearing a pale outfit decorated with a white and navy ribbon and a broad-brimmed matching hat, Kate smiled as she and her children watched the Trooping ceremony from a window overlooking Horse Guards Parade.
Much attention was paid to Prince Louis, who stole the show two years ago by pulling faces during the military flypast.
While there appeared to be no similar mischief this year, at one point the young prince could be seen dancing along during the quick march of the Scots Guards to Highland Laddie.
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Just six years' old, Prince Louis' attention did appear to waver once or twice as he was seen yawning while watching the parade from the window at the Duke of Wellington's former office.
At one point, his gaze turned to what appeared to be a blind cord in the building.
Later, the Royal Family stepped out onto the Buckingham Palace balcony to watch the RAF flypast.
The royal children looked up and later waved to the crowds as the series of jets including Typhoons and F-35s roared overhead.
Prince Louis appeared very interested in the planes flying above the capital, while his sister Princess Charlotte calmly watched proceedings as she stood next to him at the balcony.
The future king, Prince George, chatted with his father, Prince William, who was seen pointing out things to his eldest son.
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