By Colin Paterson
Entertainment reporter, BBC News
Amy Winehouse recently attended a court hearing for husband Blake Fielder-Civil
A video of Amy Winehouse apparently smoking a crack pipe has been posted on The Sun's website.
In the video, the Back To Black singer claims she has taken "six valium" before lighting up and inhaling from the pipe.
The video was reportedly filmed at her London home on Friday.
The singer's agent and the Metroplitan Police have both declined to comment on the newspaper's claims.
But her record company, Universal, said: "We are deeply disappointed and upset by these latest revelations and are doing everything we can to offer Amy our full support in dealing with her problems."
According to The Sun, Winehouse "took hit after hit of the deadly drug after a 19-minute binge in which she snorted powdered ecstasy and cocaine".
The Sun says that the video footage was taken just after 0500 GMT last Friday morning.
The footage is grainy and appears to be camera phone quality, while a date and time in the corner of the screen suggests it was filmed on a video camera.
The performer is due back in court in Bergen, Norway on 29 February to appeal against a fine for possessing cannabis.
Winehouse is scheduled to perform with Mark Ronson at the Grammy Awards on 10 February where she is nominated for six prizes, which organisers have said is still going ahead.