Amy Winehouse was booed by fans at a recent gig after appearing to be 'too drunk' to perform.
The singer kicked off her 12-date European tour in Serbia's capital Belgrade on Saturday night (June 18).
During her 90 minute set, Winehouse mumbled her way through tracks 'Valerie', 'Back To Black' and 'Love Is A Losing Game' and at one point threw her microphone on the floor, reports BBC News.
The 20,000 strong audience, who had paid up to €45 (£40) to attend the show, booed and jeered the singer.
Winehouse embarked on a treatment programme at Priory Clinic in London last month.
The singer is scheduled to play a series of European festival dates this summer but has now cancelled two of her recent dates in Istanbul tonight (June 20) and in Athens on Wednesday (June 22).
Amy Winehouse Belgrade Show -
Amy Winehouse - Through The Years