Organisers of the Glastonbury Festival today refused to rule out an appearance by Amy Winehouse as they revealed most of this year's line-up.

The troubled singer, who was last week cautioned by police after a latenight brawl, has made several previous appearances at the festival.

Winehouse, 24, was pictured answering the front door of her Camden home yesterday wearing only a bikini top and tiny denim shorts, as her father Mitch arrived bearing a tray of fizzy drinks from McDonald's.

Details of the acts for the three-day Glastonbury Festival were revealed early after artists appearing on three main stages were leaked to music magazine NME.

But after rumours circulated about whether or not Winehouse would fill the one vacant spot on the Sunday line-up for the main pyramid stage - listed in the leak as yet to be confirmed - organiser Emily Eavis refused to confirm or deny an appearance by the star.

She said: "There is speculation as to whether she's going to appear, but we can't confirm or deny that."

Rapper Jay-Z was named early as a headline act for the pyramid stage - a choice which prompted criticism from regular festival-goers. Other names, including indie stars The Verve and singer James Blunt were mentioned, after music magazines Q and NME ran leaked line-ups.

Ms Eavis, who runs the festival with father Michael, said: "Some of the information that is out is actually wrong. I think it came from the printers at Q, who actually had it first. I'm not sure the NME can claim a world exclusive.

"I'm not really angry about it - it is normal for bits and bobs to come out, and these days you can't control that anymore."

The festival, which started in 1971, plays host to 150,000 visitors. But this year's tickets failed to sell out on the first day of sale.