Singer Amy Winehouse has been released on bail after police arrested her in connection with an investigation into perverting the course of justice.
Her husband, Blake Fielder-Civil, 25, has been remanded in custody charged with attempting to pervert the course of justice.
Mr Fielder-Civil, from Camden, north London, is due to appear in court next month to face the charge.
He has also been charged with inflicting grievous bodily harm.
Earlier, a Scotland Yard spokeswoman said: "A 24-year-old woman has been arrested by appointment at an east London police station."
A statement was released on Amy Winehouse's behalf.
It said: "Amy Winehouse attended a London police station today on a voluntary basis at a pre-agreed time.
"She was arrested, as is common practice, she is being interviewed by police.
"No charges have been brought."
Cancelled tour
It is alleged that Mr Fielder-Civil, along with 39-year-old Michael Brown from Holloway, north London, attacked pub landlord James King at the Macbeths public house in Hoxton, east London, in June last year.
Police also suspect they then conspired to pervert the course of justice by offering Mr King a significant amount of money to withdraw his allegation and leave the country.
Two other men facing the same charge are Anthony Kelly, 25, from Chalk Farm, north-west London, and James King, 36, from Risley, Derbyshire.
All four have been remanded in custody until next month and are expected to go on trial in June.
Ms Winehouse has been in the headlines all year after reports of drug use, rehabilitation treatment and cancelled performances - as well as awards success and a best-selling album.
She cancelled her remaining UK tour dates following her husband's arrest.
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