He attended the 30th anniversary of the music festival with his latest lady friend, Cressida Bonas, 23, his cousin Princess Beatrice, and her boyfriend Jack Brooksbank.
It featured sets from Nigerian Afrobeat pioneer Femi Kuti, Senegal's Carlou D and South Africa's township jive quintet Hot Water.
Alongside the international acts, British performers like Revere, Scottish pipers Breabach, Mercury nominees Portico Quartet and popsters Vadoinmessico wowed music fans.
Prince Harry was spotted there on Saturday, partying up a storm, the BBC reported.
It was a well-deserved day off for the playboy Prince, who has since had a schedule packed with Olympic responsibilities, including representing the royals at the women's beach volleyball tournament.
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