The junkie singer, 24, is to be quizzed by police after claims she HEADBUTTED a Good Samaritan who hailed her a cab outside a bar.
Rehab star Amy, said to have PUNCHED a second victim in the face, sank to a horrific new low while high on Class A drugs.
Onlookers told how the married singer also SNOGGED a mystery fella at a nightspot and shocked punters by overturning tables and drinks.
She was later seen smoking drugs in the street, walked into a lamppost, and riled a cabbie by paying only HALF her promised fare home.
An onlooker said: "She was off her face, throwing drinks around and turning over tables. Amy screamed, ‘I am a legend, get these people out. I want to take drugs'."
