Prince Harry partied with Mumford & Sons until 1am following their gig at the Olympic Park on Saturday night (06.07.13).
The flame-haired royal and girlfriend Cressida Bonas were invited backstage by the band's frontman, Marcus Mumford, for free drinks with him and actress wife Carey Mulligan.
A source said: "Harry is a huge Mumford fan, as is Cressida. He was gutted to miss them at Glastonbury.
"He absolutely bear-hugged Marcus and apologised for missing their set. Marcus told him not to worry and to help himself to the beer.
"Carey was also introduced to them all. Cressida really admires Carey, too, so the girls chatted while Harry had a long talk with Marcus. They really hit it off."
Harry also got on well with Marcus' bandmate Ted Dwane - who was rushed to hospital on 10 June to have a blood clot removed from his brain - and the prince was said to be shocked to see the bassist back in the band so soon after he went under the knife.
A source added to the Daily Mirror: "Harry was really impressed that Ted had rejoined the band so quickly. The boys joked, 'Ted's alive!'"