( CNN ) -- Amy Winehouse 's attempt at a European concert tour ended in Belgrade , Serbia , with a train wreck of a performance Saturday night in which she staggered around the stage and stumbled through several songs . The audience eventually chased Winehouse off the stage with loud boos several numbers into what was supposed to be the opening show in a 12-date tour . A representative for Winehouse said her next two concert dates have been canceled . Winehouse representative Tracey Miller did not directly confirm that the `` Rehab '' singer , who has a history of battling drugs and alcohol , had fallen off the wagon . Winehouse only recently left a British rehab program that a representative said was intended to prepare her for the European concerts . `` Yes , Amy has cancelled appearances in Istanbul and Athens for the coming week , '' Miller told CNN Sunday . `` Despite feeling sure that she wanted to fulfill these commitments , she has agreed with management that she can not perform to the best of her ability and will return home . '' Video clips of the musical disaster , recorded by concert-goers ' cell phone cameras , were quickly posted on YouTube . They showed Winehouse failing in every attempt to sing more than a few slurred lines of her songs . Audience members could be heard filling in the gaps , along with her back-up singers . `` She would like to apologize to fans expecting to see her at the shows but feels that this is the right thing to do , '' Miller said . When Winehouse entered a rehab program at London 's Priory Clinic last month , a representative told CNN that `` she wants to be ready for performances in Europe this summer and decided to seek an assessment . '' CNN 's Denise Quan contributed to this report .
Online reports said the ` ` ' '' were unable to perform in Serbia . The Serbia concert was suppose to kick off a 12-date European tour . Winehouse entered a rehab facility last month to prepare for the tour .