Amy Winehouse, whose promising career has been crippled by substance abuse problems, cut short a European tour on Sunday after fans in Belgrade jeered her shoddy opening-night performance.

Winehouse, 27, sporting her trademark bouffant hairdo and figure-hugging dress, struggled to perform her songs and keep her balance as her band gamely played on. On some tunes, the audience did most of the singing. On other occasions, Winehouse lectured her bandmates, and anxiously clutched her arms. She appeared to be reading the lyrics from a teleprompter. The singer was headlining a Serbian festival, whose lineup included techno singer Moby.

A representative said upcoming festival dates in Istanbul on Monday and in Athens on Wednesday would be canceled. Her next show is scheduled for July 8 in Spain. – Reuters