Six young kids have been arrested for allegedly attacking pop singer Lily Allen after a snowball fight in London turned very nasty.Lily was enjoying a day of winter fun at the city’s Primrose Hill park yesterday, playing in the snow and hanging with a group of friends. Allen was earlier photographed laughing and joking with the England paparazzi, and she was even trading a few handfuls of snow with the celebrity photographers. But during the afternoon, a gang 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.