The Duke of Cambridge, Prince William, spotted in central London while selling the famous Big Issue magazine, BBC reported on Thursday.
The photos of Prince William were posted by retired Police Ch Supt Matthew Gardner on Rochester, in Westminster, on social media.
He revealed his brother-in-law, Richard Hannant, took a distanced photo for the Prince, before, the Duke of Cambridge stepped closer to him and spoke to him.
Hannant, a property manager, told BBC that he was on his way back to the office when he saw the Senior Royal member in the street.
Hannan described: "He was amazing, he was so friendly," adding: "I think what struck me is we've just got past a massive Jubilee event and days later he's out there supporting a charity like Big Issue."
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The English man continued: "I think it's that that I thought was most amazing because one is a worldwide event, this is just a low-key [event], literally standing on the side of the road with a homeless person.
"I was quite amazed that he could go from one massive event to such a low-key thing."
The Prince also took to two Lithuanian tourists Vitalijus and Laura Zuikauskas who were touring London after witnessing Queen Elizabeth II Platinum Jubilee celebrations.
Zuikauskas told the BBC: "We bought the magazine and had a warm chat,"
She continued: "We wished him good luck and shook hands, and were excited that the Royal Family take big care of ordinary people."
Last week, the events of the Platinum Jubilee of Queen Elizabeth II started with the Flypast, and Trooping the Color with the participation of the Queen and a number of senior members of the Royal family including Prince Charles, the Crown Prince, and Duchess Camilla, the Duchess of Cornwall, Prince William, the Duke of Cambridge, Duchess Kate, the Duchess of Cambridge, and their children.
The events of the occasion lasted for four days with different occasions such as Platinum Jubilee Thanksgiving services, and the Buckingham Palace Concert that featured Queen and Adam Lambert, Elton John, and others.