Prince William has been spotted selling the Big Issue magazine in central London. 

Wearing the magazine sellers well known red hat and vest, the Duke of Cambridge took to the streets of Westminster to sell copies of the magazine. 

The Big Issue has been sold for more than thirties years, starting back in 1991, and offers homeless people the chance to earn an income.

And now it seems the future King wanted to try his hand at being a vendor as he took to the street of Rochester Row. 

The royal was only discovered when a passerby spotted the celebrity from a distance and took a photo before investigating. 

As restored police chief superintendent Matthew Gardner, posted on his Linkedln that his brother-in-law had snapped a pic with the Prince. 

Saying: "My brother-in-law was in London today and saw a celebrity, so he took a photo at a distance.

"The celebrity saw the 'covert surveillance' effort and crossed the road to investigate further."

The former superintendent shared his remarks on what special memory it was saying: "What an honour to have a private moment with our future king who was humble and working quietly in the background, helping the most needy."

And it seems the Duke was getting in the swing of being a Big Issue seller after appearing with a card machine:

" The finale to this unique occasion was when Prince William asked my brother-in-law if he wanted to buy the 'Big Issue', to which he replied; 'I have no change.

"At this point William produced a mobile card machine… you cannot teach that!

"Priceless, or should I say 'Princely."

The Prince was also spotted by black cab driver Neil Kramer who took to social media to share his photo with the Duke. 

Writing the simple caption: "Hi I'm William would you like to buy a copy of the Big Issue."