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PRINCE William has posted a touching Father's Day tribute to his 'Pa' King Charles with a nostalgic photo taken 40 years ago.
The sweet snap shows a young William playing football with his father on June 12 1984.
"Happy Father's Day, Pa," the post, personally signed by William, said.
Earlier today, King Charles posted his own touching Father's Day tribute to Prince Philip with a sweet video montage taken over 70 years ago.
The monarch posted the throwback video featuring memories of his father on the Royal Family's official Twitter account.
The heartwarming post was titled: "Wishing all Dads, and those who may be missing their parents today, a relaxing Father’s Day."
Some of the nostalgic memories showed Prince Philip holding aloft Charles while he was a baby.
A young Charles enjoyed sailing with his father in the black and white footage, as well as playing outdoors.
Charles looked adorable as he laid on a blanket in the garden while clutching on to his stuffed rabbit toy.
Another sweet clip showed King Charles feeding horses with his father while Queen Elizabeth watched on.
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It comes as Charles braved the pouring rain to salute troops at his first Trooping the Colour since his cancer diagnosis.
The monarch looked regal as he and Queen Camilla headed to his official birthday ceremony yesterday.
Charles, 75, and Kate, 42, were then reunited on the Buckingham Palace balcony for the first time since they both began cancer treatment.
It was a brave return to public life for Kate who has valiantly battled cancer for the last three months.
The Princess of Wales joined other members of the Royal Family to watch a spectacular flypast by the RAF as she made a triumphant return to public life at Trooping the Colour.
She beamed on Saturday as she made her first public appearance in months with doting husband Prince William and their kids at her side.
Kate looked stunning dressed in white as she laughed and chatted away to her family.
Prince William, who looked dapper in his red Irish Guards uniform, proudly donning medals on his chest, beamed at crowds, too.
Well-wishers held Union Jacks high as they squished together along the Mall - donning crowns and fascinators atop their heads.
The streets were coloured red, white and blue, as fans waited patiently to see the Princess of Wales.
Crowds erupted in the afternoon as Princess Kate stepped onto the balcony with Wills and her kids at her side.
The day had been plagued by rain but downpours couldn't dampen Kate's shine as she beamed alongside her family.
Fans watched on in awe as the Princess joked and laughed with her children.
Princess Kate earlier shared sweet behind-the-scenes footage of her with George, Charlotte and Louis leaving for Trooping the Colour.
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And while her appearance was highly anticipated by many, the Princess of Wales was eager to deflect attention away from her according to a body language expert.
She explained that Kate was keen to ensure that her father-in-law remained the focus during Trooping the Colour.