The Prince met pop idols Gareth and Will Young backstage after a big concert for the Prince's Trust charity on Thursday night.
Gareth was wearing the ripped keks complete with an Elvis-like studded belt with his name on it.
More than 12,000 fans crowded the Wembley Arena for the gig by the chart toppers, who are currently at number one with The Long And Winding Road.
The two heart-throbs are celebrity ambassadors for the charity, which helps young people all around the world.
The concert is expected to have raised about £250,000 for the Trust.