by Breaking Celebrity News Staff

Amy Winehouse's problems continue.

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.