by Radar Staff
Her entire summer tour has been canceled after a miserable Saturday night show in Belgrade, where she was an hour late and could barely perform. Even worse, she didn't know what city she was in, greeting the 20,000+ crowd by saying, "Hello, Athens!"
In the wake of the embarrassment, the retro-soul singer, 27, canceled Monday's concert in Istanbul and Wednesday's in Athens.
Winehouse has had a well-documented history of personal battles with drugs and alcohol, having checked into rehabilitation facilities to battle her demons, most recently this past May.
"Despite feeling sure that she wanted to fulfill these commitments, she has agreed with management that she cannot perform to the best of her ability and will return home," her reps said. "She would like to apologize to fans expecting to see her at the shows but feels that this is the right thing to do."