Amy Winehouse was released on Saturday from the police custody, her spokesperson announced. She has spent the night at Holborn Police Station in central London after arriving for questioning Friday afternoon.

Winehouse was questioned by police officials over allegations of assault. A 38-year-old man made a complaint to police in Kentish Town that she had assaulted him. It appears that Amy Winehous headbutted an onlooker, who tried to help her get a taxi. She thought he was trying to molest her. She also punched a second person in the face.

In a press statement issued on Saturday, Winehouse spokesman Chris Goodman said the singer "admitted to a common assault by slapping a man with an open hand and accepted a caution." "Amy was fully cooperative with inquiries and apologized for the incident," Goodman added.

According to People.com, Amy Winehouse was “in no fit state” to be questioned when she arrived at the police station on Friday.

Also on Friday her husband, Blake Fielder-Civil, appeared at Snaresbrook Crown Court. He is charged with attempting to pervert the course of justice and inflicting grievous bodily harm. The 25-year-old denies the charges. While Winehouse had been due to attend her husband’s hearing, she did not appear.

Amy Winehouse may have the queen of the Grammy Awards this year, but her personal life continues to be troubled.

At this year’s Grammies Amy Winehouse was nominated in six categories, including all four top categories: album of the year, song of the year, record of the year and best new artist.

In the end, Amy Winehouse won five awards including best new artist, best pop vocal album for “Back To Black” and best female pop vocal.

Unfortunately, because the US embassy in London has granted her a work visa too late, Amy Winehouse attended the Grammies ceremony via a satellite link.

Earlier this year, Amy Winehouse checked in the Capio Nightingale clinic in North London after a video of her smoking crack cocaine surfaced online.

In December last year, Amy Winehouse was arrested in connection with her husband Blake Fielder-Civil’s obstruction of justice case. She was questioned regarding her husband’s alleged $400,000 plot to fix his assault trial.

At the time, Winehouse voluntarily went to the Shoreditch police station in east London to be formally booked on a charge of perverting justice and was later released after being fingerprinted and having provided a DNA sample.

Last October, she was arrested in Norway for possession of cannabis. Amy Winehouse paid a fine and later said she had not been aware that under Norwegian law, paying the fine was equivalent to pleading guilty.

A judge agreed to postpone her court hearing, which was supposed to take place on 29 February in Norway, because her jailed husband Fielder-Civil must also attend the hearing.