The celebrations marking Her Majesty's 70-year reign began on Thursday morning as she walked out onto the Buckingham Palace balcony joined by many of her family members – including her son Charles.
And while the event was a joyous occasion, the Prince of Wales couldn't help but get a little emotional at watching the Trooping of the Colour flypast.
Standing next his mother, Her Majesty Queen Elizabeth II, 96, Charles became visibly emotional as he watched the red arrows fly over head.
He then turned to the monarch to tell her something as she beamed with delight at the events unfolding before her. Get exclusive celebrity stories and fabulous photoshoots straight to your inbox with OK!'s daily newsletter Prince Charles, 73, was joined by his wife Camilla, Duchess of Cornwall, also 73, while his son Prince William, 39, and his wife Kate Middleton, 40, stood on the Queen's other side along with their three children.
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