Amy Winehouse allegedly punched a fan who apparently groped her breasts during her Glastonbury performance on Saturday.
The troubled star lashed at a male member of the audience as she stepped down from the stage to get closer to the crowd for her final two songs.
Amy was caught on camera hitting out at the fan several times before security separated the pair.
Glastonbury organiser Michael Eavis has defended the Rehab singer's actions, insisting she was only defending herself.
He said: "The fan deserved it. He grabbed Amy's breasts as she went past him."
A spokesman for the Grammy award winner claims the attack was provoked when a fan tried to pull at Amy's famous beehive hairstyle.
He said: "The 'lashing out' was when someone tried to grab her hair and she reacted."
Police have revealed they will not pursuing the incident.
Amy - who was in hospital last week being treated for scarring of the lungs - also commented on Jay-Z's controversial appearance on the Pyramid Stage.
She told the audience: "He has got some front to come here with tunes you don't even remember."
The star also claimed her imprisoned husband Blake Fielder-Civil was being released in two weeks.
She excitedly told the crowd: "My husband is out of jail in two weeks."
Elsewhere at the world famous music event, Neil Diamond treated fans to a set full of his classic tracks including, I'm a Believer - which he penned for The Monkees - and finishing with Sweet Caroline.
One surprise performance saw Lily Allen appear on stage with superstar producer Mark Ronson, another weekend highlight included dance act Hot Chip being joined on stage by Wiley for a rendition of his hit Wearing My Rolex.
Older festival goers were left thrilled by blues legend Buddy Guy, while new pop sensation The Ting Tings attracted younger music fans.
Glastonbury was closed on Sunday night by recently-reformed British rockers The Verve.
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