Musician Eric Clapton was among the celebrity ambassadors of the Prince's Trust to attend a fundraising dinner in aid of the charity.
Prince Charles shared jokes with his trust's three celebrity ambassadors
The Prince of Wales and the Duchess of Cornwall were guests of honour at the London gala for the trust, which helps disadvantaged young people.
Stephen Fry and Jools Holland also attended the Banqueting House event.
The lots in a celebrity auction for the trust included a yoga lesson with actress Gwyneth Paltrow.
Bidders were also offered the chance to have their garden designed by Alan Titchmarsh or obtain a dress worn by singer Beyonce Knowles to the Oscars.
Founded by the Prince in 1976, the charity has helped more than 500,000 underprivileged young people pursue their dreams.
In a speech, Prince Charles said he wanted to help young people who were "not on anybody's radar".
He said: "I want my trust to invest in their futures so they can lead lives that are fulfilling for themselves, their families, their communities, and their country."
Some of those who have been helped by the trust attended the dinner.
Singer and guitarist Sarah Bennett, 26, from Guildford, Surrey, slept on the streets for three years and used drugs before she attended a Prince's Trust music workshop.
Since then, she has supported Will Young in concert.
She said: "When I joined the programme I didn't think I could sing but today I've been singing and jamming with Eric Clapton."