The Princes spent time listening to the stories of Josh and the other young people in the lead up to the awards which were presented in honour of their mother, the late Princess of Wales.
To mark the occasion Prince William took to the podium to reflect on his mother's own legacy, remarking that this year will be the 20th since her death. "From helping to shatter the stigma around AIDS, to fighting to ban landmines and supporting the homeless-she touched the lives of millions", William said.
William, 34, noted the young age at which Diana died in a Paris auto crash in 1997, saying, "The truth is, though, that she was taken at only 36, just slightly older than I am today".
Harry highlighted how his mother, who worked tirelessly on behalf of charities around the world, taught him the "value of doing good when no one is watching".
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William and Harry are patrons of countless charities that carry on their mother's legacy.
Aged between eleven and their late-teens, the 20 winners of the Legacy Award came from countries around the world including the US, India, Belize and the United Arab Emirates.
"During her treatment, Faith's aunt told her how she got very cold, so Faith made her a fleece blanket to provide comfort, warmth and love", reads the Diana Awards program, as reported by the Peterborough Examiner.
Referring to Diana's age when she died in 1997 - "only 36, just slightly older than I am today" - he said that while he would never know what else she might have accomplished, "Harry and I feel that our mother lives on in the countless acts of compassion and bravery that she inspires in others".
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William's younger brother, Prince Harry, also took to the stage, revealing some of Princess Diana's private efforts.
Speaking to the crowd, Prince Harry had some inspirational words for the young award recipients.
The royal brothers were making their first joint appearance at an event run by the Diana Award, established to promote their mother's belief in the positive power of young people.
"You should be absolutely proud of what you've started and what you've achieved, you're still in your teenage years - don't stop now guys".
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