Janny Assiminos broke with royal protocol to give the new King an enthusiastic kiss on the cheek as he greeted mourners outside Buckingham Palace.
The royal fan, who had stood outside Buckingham Palace when the King married Diana, Princess of Wales, told the Telegraph her heart was "pounding" when the royal walked towards her section of the crowd on Friday.
"I asked the policeman, 'Is that the King coming?' He nodded. When he approached my heart was pounding. He held out his hand. I took it. I said, 'I'm sorry for your loss'. He said, 'Thank you'.