Amy Winehouse quizzed over crack video

Amy Winehouse's Grammy performance might never happen - after policed quizzed the troubled star yesterday about smoking crack cocaine.

The singer - who's currently battling her drugs demons in rehab, needs a US visa to go to Sunday’s prestigious ceremony in Los Angeles, where she is nominated for six awards.

Amy's chances of being allowed to cross the pond were already in doubt after she was fined for cannabis possession in Norway last October.

A worried pal said last night: "The timing of this isn’t great. She is desperate to go to The Grammys and needs to show US officials she is taking her rehabilitation seriously."

Cops went to North London’s Capio Nightingale clinic to grill the 'Back to Black' star for two hours.

A complaint had been received about Amy’s drugs binge - which was revealed last month in a shocking video posted on a newspaper's website.. She was filmed smoking crack after taking cocaine, ecstasy and Valium.

A source added: "She was not arrested. She is co-operating with police."

Busty Amy looked well when she briefly left rehab on Monday to meet US officials over her visa.

The pal added: "Being nominated for six awards is the one thing that motivated her to do rehab."