See Prince William in a never-seen throwback photo with mom Princess Diana

It was a trip down memory lane for Prince William on Friday (May 13) during an engagement at The Passage in Victoria, London. The Duke of Cambridge last visited the homeless charity upwards of 23 years ago when he accompanied his late mother Princess Diana as a young boy.

William, 33, was presented with a special gift – a framed photograph of himself, Diana and his brother Prince Harry taken in 1994. This was the second time that the Prince had visited the charity as a youngster. His first visit was in 1993.

The future King gave a speech, praising the charity which has helped more than 10,000 people in crisis since it was founded in 1980.

TAP TO SEE FULL GALLERYPrince William received a framed photograph of himself, Diana and Harry

He also reminisced on the past, saying: "The visits I made as a child to this place left a deep and lasting impression upon me – about how important it is to ensure that everyone in our society, especially the poorest, are treated with respect, dignity and kindness, and are given the opportunities to fulfil their potential in life.

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"Through the vision and dedication of those at The Passage, and the support of many wonderful people in this room, St. Vincent's Centre has been completely refurbished; ensuring The Passage will be there to meet the needs of the most vulnerable in our society for many years to come."

William had the honour of opening their newly refurbished centre, as well as seeing how the charity is helping the city's homeless transform their lives for the better.

The picture was taken in 1994 during a visit to The Passage

The Prince, who wore a smart navy suit and tie, was introduced to one of the charity's beneficiaries, Alex, who showed William around his flat.

He was given a tour of the research centre, which now has a winter garden, training space and medical centre. He also stopped by the restaurant to chat to staff, volunteers and people who are supported by the charity.

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The visit will no doubt have brought back memories for William, who was 11 when he first joined his mother Diana on the engagement. William's younger brother Harry, who was nine at the time, also took part.

The visit was seen as fairly controversial at the time and a real departure from traditional royal duties. From then on, William and Harry regularly visited hostels for homeless people with their mother Diana, and learnt about services that combat the problem.

William was given a tour around Alex's flat

William paid the ultimate tribute to his mother by continuing to champion her cause after Diana's death in 1997. He became a patron of Centrepoint, a homeless charity for young people, in 2005. He even slept rough on the streets of London in December 2009 at the height of winter.

The future King bedded down next to wheelie bins under Blackfriars Bridge with Centrepoint chief executive, Seyi Obakin, and his private secretary, Jamie Lowther-Pinkerton.

The group almost got run over by a roadsweeper during the night, although William said that he took away a lot from the experience. He was able to appreciate "the importance of tackling all the issues that cause people to be homeless and stay homeless, from drug dependency to mental health problems," St James' Palace said at the time.

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