Lily Allen burst into tears onstage at London's O2 arena last night as she witnessed a punch up in the audience.

The Smile singer fled the stage as the two middle aged men started a fight with each other. The were quickly removed by security and Lil returned a few minutes later.

She told the crowd: "That's the worst sort of violence.

"It's f***ing sick and you lot should be ashamed of yourself."

Poor Lily!

The singer also courted controversy by dedicating her song F*** You to Tory leader David Cameron.

Last month it was revleaed that Mr Cameron banned his 6-year-old daughter from listening to Lil's music, saying the lyrics were unsuitable.

Lily said: "I'd like to dedicate this next song to someone. David Cameron."

Ouch...

We wouldn't want to get on Lily's bad side...