‘Jay-Z’s bouncers moved in and there was a massive ruckus. Things really kicked off as his heavies all piled in on the bloke.’
The alleged VIP rumble came after Bey had happily joined the revellers on Hackney Marshes at the Radio 1 bonanza.
Her husband was joined on stage by controversial British rapper M.I.A, who fell victim to yet another stage blunder after her mic went off during her cameo.
Rihanna also appeared during the 70-minute set, before the 42-year-old rap mogul sang hits including 99 Problems and Empire State Of Mind.
Kanye West helped him go out with a bang by coming on for the encore. The crowd at the BBC Radio 1 event had earlier been treated to sets by Leona Lewis, Rizzle Kicks, Ed Sheeran, Nicki Minaj and Kasabian on the main stage.
Jack White, Swedish House Mafia, Emeli Sande, Dappy and Rita Ora were among the other acts to play on the smaller stages.