LONDON - British singer Amy Winehouse has been cautioned after admitting an assault during a night out in London, police said Saturday.

Winehouse, known for songs including "You Know I'm No Good" as well as her troubled private life, was involved in a fracas as she tried to hail a taxi in the early hours of Wednesday in Camden, north London.

The singer's spokesman said she had admitted "slapping a man with an open hand."

Media reports said she had headbutted one man and punched another.

She was cautioned for common assault, meaning she has admitted the offence and now has a criminal record, a spokesman for London's Metropolitan Police said.

Winehouse, 24, was held at a central London police station overnight but left Saturday.

She now faces no further action.

The Grammy award winner, whose album "Back To Black" includes the hit "Rehab", has fought a very public battle with alcohol, drugs, self-harm and an eating disorder.

She was charged with possessing cannabis in Norway last year and is awaiting a court appearance over the allegation.

Winehouse's husband, Blake Fielder-Civil, 25, is currently on remand in prison awaiting trial on charges of assault and conspiracy to pervert the course of justice.

He was brought to court in north-east London Friday for an administrative hearing.

Unlike previous appearances, his wife was not there to provide support. - AFP/vm