The singer, 24, at the Big Day Out Festival in Australia collapsed on the ground after performng to thousands of fans on the hot summer day. With her make up smudged and messy hair dripping with sweat, the singer wobbled across the tarmac before stumbling on the floor.

Lily Allen performs live at the O2 Academy in Glasgow, Scotland

Lily Allen performing skimpily at "G-A-Y at Heaven" in London

Six youths have been arrested for allegedly attacking singer Lily Allen after a snowball fight in London turned nasty.

Allen was enjoying a day of winter fun at the city's Primrose Hill park on Monday, playing in the snow and sledding with a group of friends. (Photo)

Allen was photographed laughing and joking with the paparazzi and even traded a few handfuls of snow with the snappers.

But during the afternoon, a group of six youngsters began pelting the star with snowballs, and the innocent game soon turned violent, forcing Allen to call police and flee with her bodyguard, according to London's Evening Standard newspaper.

A source tells the publication, "She took it in good spirits at first, but it got more relentless. Some people told the gang to stop before people started squaring up to them."

One man was said to have been badly beaten during the incident. via

Lily Allen Enjoying The Snow At Primrose Hill,London