Or maybe I should say she finished it. Why would you mess with Lily Allen?  She doesn't really seem like the type of gal you wanna f--k with but last night someone made that mistake.  Lily (who was looking hot in a purple dress) and a friend were leaving Ronnie Scott's Jazz Club in London  when a passerby in the crowd started taunting her.  Sources say that at first Lily tried to ignore the girl but she was persistent and would not stop harassing her so Lily snapped.  Apparently Lily made contact with the anonymous aggressor and punched her about three times before the scuffle was broken up.
It's a shame when someone has to ruin your night like that, but at least it makes for good song material, right?