Girls Aloud star Cheryl Cole has slammed fellow British singer Amy Winehouse, claiming the troubled star's fondness for alcohol leaves her unable to perform onstage.

The 24-year-old-- who recently announced she feels "no sympathy for drug addicts"-- has criticized the Rehab hitmaker for her unimpressive performance to date at the MTV Europe Music Awards earlier this month.

Winehouse surprised fans by mumbling through a performance of hit Back To Black at the ceremony in Munich, Germany, and appeared to have forgotten the song's lyrics.

Cole says, "You know what it's like? When a pub singer's pissed and they go 'shoobedoo waah'."

-Girls Aloud Pictures
-Amy Winehouse Pictures

(This news article provided by World Entertainment News Network)