IN PICTURES: Princess of Wales' public return as royals unite at Trooping the Colour
It's already one of the most memorable days on the royal calendar every year.
But this year's Trooping The Colour will be etched in history books as the Princess of Wales made her public return following news she was undergoing preventative chemotherapy after evidence of cancer was detected during a planned surgery in January.
Kate's first official appearance in six months was alongside her children Prince George, Princess Charlotte and Prince Louis, who have also been mostly kept out of the spotlight.
See all the photos and fanfare of the event held in honour of King Charles' birthday.
The Princess of Wales makes her long-awaited royal return at Trooping the Colour, more than six months after her last official public outing.
Huge cheers erupted as the royal family stepped out onto the Buckingham Palace balcony.
It was also the first time the public has seen all three of William and Kate's children together in six months.
Since Kate shared her health news with the world in a powerful video, William has been by her side.
Here, the Prince and Princess of Wales share an emotional moment together as millions watched on from home.
Prince Louis stole the show on the balcony where he was seen doing a little dance, making faces and at one point having a big yawn.
It was a big day for the little prince!
All eyes were glued to the cheeky prince when he gave everyone watching a big double wave.
A cute mother-daughter moment for Kate and Princess Charlotte.
King Charles and Queen Camilla chat with granddaughter Princess Charlotte on the balcony.
Kate beamed at William as thousands watched the family step out on to the Buckingham Palace balcony.
After a difficult six months, the royal family were united as they stepped onto the balcony together.
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