The King shared a warm embrace with his niece, Zara Tindall, as she and husband, former rugby star Mike, joined His Majesty at the opening day of Royal Ascot on Tuesday.
Charles, 74, was pictured kissing 42-year-old Zara after he and Queen Camilla arrived at the Berkshire racecourse in a carriage procession.
Equestrian Zara looked beautiful in a botanical print midi dress by Australian label, Leo Lin, and a bespoke boater-style hat by Sarah Cant, finishing off her look with a pair of embellished heels from Sauvereign.
The mum-of-three is said to share a close bond with her uncle Charles, and the pair have often been spotted hugging or sharing a giggle together at public events over the years.
It's no surprise given the tight-knit relationship between Charles and Zara's mother, the Princess Royal, who supported her brother in major roles at his coronation in May and Trooping the Color this past week.
The King and his niece also share a passion for horses and equestrian sports, with Zara winning a silver medal as part of Team GB's eventing team at the London 2012 Olympics.
Both Zara and her older brother, Peter Phillips, attended Charles and Camilla's nuptials in Windsor in 2005, with the future King and Queen returning the favor at Mike and Zara's Edinburgh wedding in 2011.
Musing on his energetic dance moves, he added: "I broke my flag; I was that enthusiastic. I did think at one point, 'I really want to dance right now… rip my trousers off… we knew that Kermit was coming at some point, and I was like, 'Could I dance with Kermit the frog?'… I enjoyed myself."
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