Winehouse is one of Britain's top-selling singers, winning critical and commercial success with her album "Back to Black," which garnered six Grammy nominations in December.

The 2006 album has sold nearly 5 million copies worldwide, including 1.3 million in the United States.

The Grammy awards take place in the United States on February 10, but Winehouse's involvement has been in doubt because of her arrest for possession of marijuana in Norway last year.

Winehouse, summoned to appear in a Norwegian court on February 29, has denied having anything to do with the marijuana and said she unwittingly signed a document accepting a fine.

British police also plan to investigate the video of Winehouse allegedly smoking crack cocaine, which came to light in the Sun tabloid this week.

The footage was taken early on Friday morning. Hours later, a disheveled-looking Winehouse appeared in court to support husband Blake Fielder-Civil, who is fighting charges related to a pub brawl.

Universal called her "the most talented and important musical artist of her generation" who had already "made huge strides on her road to recovery."

One of her most famous songs is called "Rehab," which opens with the lyrics: "They tried to make me go to rehab, I said 'no, no, no'."

She attended rehab clinics at least twice in 2007, according to British media, but checked out on both occasions before her treatment was completed.