AceShowbiz - Amy Winehouse has sparked fresh fears for her health after she slurred and stumbled her way through a comeback concert in Russia at the weekend. The "Rehab" hitmaker flew out to Moscow to play her first official gig for more than two years after taking time out to battle her drink and drug demons.

The British singer was reportedly back to full health and ready to relaunch her career with a series of shows - but reports in Russia suggest she was drunkenly swaying and slurring her words during the performance after downing a bottle of whisky backstage.

Winehouse will be paid $450,000 for the Russian concert and a series of gigs in Brazil next month, according to Britain's The Sun. Rumor has it, the concert was funded by a mystery Russian businessman.