TROUBLED singer Amy Winehouse will not be allowed to perform at the Grammy Awards because her US visa application has been rejected.The 24 year-old star - currently in rehab for drug addiction - had been invited to sing at the event on Sunday.

TROUBLED singer Amy Winehouse will not be allowed to perform at the Grammy Awards because her US visa application has been rejected.

The 24 year-old star - currently in rehab for drug addiction - had been invited to sing at the event on Sunday. She has been nominated for six awards.

But the US Embassy in London turned down her application.

A spokesman for the star said: "Amy Winehouse will not be performing at this year's Grammy Awards ceremony.

"Unfortunately, her application for a visa to enter the United States of America has been rejected at this time by the American Embassy in London.

"Amy has been progressing well since entering a rehabilitation clinic two weeks ago and although disappointed with the decision has accepted the ruling and will be concentrating on her recovery.

"Amy has been treated well and fairly by the embassy staff and thanks everyone for their support in trying to make this happen.

"There will of course be other opportunities and she very much looks forward to visiting America in the near future."