Amy Winehouse dead
It is understood her death is being treated as "unexplained".
The Back To Black artist cancelled all tour dates and engagements last month after a series of erratic public appearances.
She had been troubled by drink and drugs problems throughout her career.
The singer made her last public appearance on Wednesday night when she joined her god daughter Dionne Bromfield on stage at The Roundhouse in Camden. The singer danced with Bromfield and encouraged the audience to buy her album in the impromptu appearance before leaving the stage.
London Ambulance Service said it was called to the flat in Camden Square at 3.54pm. Two ambulance crews arrived at the scene within five minutes and a cycle responder also attended, according to a spokeswoman.
"Sadly the patient had died," she added.
Winehouse joins the notorious "27 Club" of musicians who have died at that age after struggling to cope with fame.
They include Rolling Stone Brian Jones, who drowned in a swimming pool in 1969; guitarist Jimi Hendrix, who choked to death in 1970 after mixing wine with sleeping pills; and singer Janis Joplin, who suffered a suspected heroin overdose the same year. Doors star Jim Morrison, who died of heart failure in 1971, and Nirvana front man Kurt Cobain, who shot himself in 1994, are also members.
