Prince William has chosen a young people's homelessness charity as the first to which he will be a patron.
Prince William first visited Centrepoint with his mother
The 23-year-old will be following in the footsteps of his mother, who became a patron to the charity in 1992.
Clarence House said William had spent the past two days working as a volunteer at Centrepoint.
He said he was "deeply concerned" for people, especially the young, "who find themselves living on the streets or without a proper home".
Prince William said he was delighted to accept the organisation's invitation.
During his volunteer work he spoke with homeless people about their situation, helped them review their personal development plans and to sort out housing benefit claims and find more permanent accommodation.
"Charities like Centrepoint do such an amazing job in helping to combat homelessness and social exclusion and I just wanted to lend my support to their remarkable efforts," he said.
Centrepoint chief executive Anthony Lawton said it was "wonderful" that William had decided to support them.
"He is the same age as many of the young people we support and he gets on so well with them," said Mr Lawton.
"I know that all the young people he was worked with over the last few days will think this is fantastic news."
Centrepoint was one of a number of organisations to which Princess Diana was a patron
She took Prince William to visit homelessness charities in London when he was a child and two years ago he visited a project in Newport, Wales, with Prince Charles.
Clarence House said William's work experience at Centrepoint would be followed by other placements previously announced, including those with a mountain rescue team, financial institutions and in land management.
In the long term he is expected to follow a career in the military.
His role as patron of Centrepoint will be reviewed every five years, as will any other patronages.