Lily Allen has a melt down in London

Lily Allen has had an emotional breakdown at a show after witnessing a fight in the audience.

The singer was horrified by the brawl in the crowd at London;'s O2 Arena and left the stage in tears as security escorted the middle-aged men out.

Upon her return she is quoted to have said:

"That's the worst sort of violence.  It's fucking sick and you lot should be ashamed of yourself"

The show was one of Allens final performances before she retires to open a vintage clothes shop.