Winehouse won five Grammy awards earlier this year
Singer Amy Winehouse has been sent home after spending the night in hospital.
The 24-year-old was taken to London's University College Hospital after treatment for reaction to "medication".
A spokeswoman said she was ushered out via a private exit shortly after 9.45am and was said to be in "good spirits" after a "comfortable night".
There have long been concerns about the star's health, and last month she received treatment for traces of lung disease emphysema.
Winehouse's father Mitch, who has previously expressed fears over the effect his daughter's drug use has had on her health, spent the night with his daughter in hospital.
He told BBC Radio One Newsbeat that the singer was well enough to eat a KFC meal with him on Monday night, adding "she scoffed the whole thing".
The singer is playing several festival dates over the summer
The ambulance was called to her house in Camden, north London on Monday evening.
A London Ambulance Service spokeswoman said: "We were called at approximately 8.40pm to an address in NW1 to reports of an adult female taken unwell.
"We sent an ambulance and a fast response car and the patient has been taken to hospital."
Crowd of photographers
Police were called at about 2100 BST to clear a path for the ambulance through waiting photographers.
A Scotland Yard spokesman said: "We were asked to assist the London Ambulance Service leaving the vicinity where a crowd of photographers had gathered."
Winehouse hit headlines last week when her husband, Blake Fielder-Civil, 26, was jailed for 27 months for attacking a pub landlord and perverting the course of justice.
Judge David Radford said Fielder-Civil was high on alcohol and cocaine when he and another man attacked the landlord outside the pub in 2006.
Fielder-Civil has already spent nine months in jail on remand.