The troubled singer punched a fan, spit gum into the crowd, criticized Jay-Z and called Kanye West an unmentionable name at the Glastonbury music festival Saturday night.

Although she appeared a little loopy, Winehouse, 24, got off to a good start with her set at the annual British music fest, belting out "Tears Dry on Their Own," "Wake Up Alone" and "Back to Black."

But things went downhill fast when the Grammy Award winner was booed by the crowd after mentioning her incarcerated husband, Blake Fielder-Civil. "Don't boo. I'll find your phone and ring your mum and tell them about your bad manners," Winehouse said, per U.K. newspaper The Sun. "Manners cost you nothing."

Winehouse later spit her gum into the crowd and criticized fellow Glastonbury performer Jay-Z. "Jay-Z's got some front to come here with tunes you don't even remember," she said. Winehouse then instructed the crowd to welcome the rapper, noting that fans should be glad West wasn't about to perform because - as she so eloquently said - he's a "c---."

Before wrapping things up, the singer launched into "Rehab" - and repeatedly punched an audience member in the front row while working the crowd. Winehouse kept singing while she threw her right hook, by the way.



Glastonbury organizer Michael Eavis made no apology for Winehouse's behavior, saying "the man deserved it. He grabbed Amy's breasts as she went past him." But, according to the singer's publicist, Winehouse lashed out after a fan tried to grab her hair.

Winehouse was recently hospitalized for a week after fainting in her London home. According to the singer's father, she has 70 percent lung capacity as a result of "smoking the crack cocaine and the cigarettes."

Winehouse reportedly checked back into the hospital following her illustrious Glastonbury gig.