LONDON , England ( CNN ) -- Troubled pop star Amy Winehouse spent the night in a London hospital after suffering a reaction to a medication she was taking at home Monday night , according to her spokeswoman . Amy Winehouse 's husband was recently jailed for 27 months . Tracey Miller said she could not say what medication was involved . A statement from University College Hospital said Winehouse had been kept in overnight for observation . She had a comfortable night and was released Tuesday morning , the statement said . London Ambulance Service said it transported the singer after being notified of `` an adult female taken unwell . '' Winehouse 's spokesman in London , Chris Goodman , told the British Press Association that he had not been told what was wrong with the 24-year-old singer , who is well known for her song `` Rehab , '' describing the singer 's reluctance to enter a clinic . The pop singer was investigated this year after a London tabloid made public a leaked home video that showed her smoking something in a glass pipe minutes after she was heard saying she had just taken six tablets of the anti-anxiety drug Valium . Police declined to file charges . The singer has battled drug addiction and spent about two weeks in a rehabilitation clinic in January . Winehouse won five Grammy awards this year -- three for `` Rehab '' as well as Album of the Year and Best New Artist . Winehouse 's Grammy winning album , `` Back to Black , '' is still a big seller , recently charting at No . 12 in the UK more than 19 months after its release . Madame Toussaud 's London wax museum recently unveiled a wax statue of Winehouse alongside Madonna , Jimi Hendrix , the Beatles , Justin Timberlake , Beyonce and other musicians in the museum 's `` Music Zone '' exhibit . On July 21 , Winehouse 's husband was jailed for 27 months . He admitted to brawling with a pub manager and then offering him $ 400,000 to not talk about the incident .
Amy Winehouse leaves hospital after spending the night under observation . Spokesperson says singer had reaction to medication she was taking at home . Ambulance took 24-year-old Winehouse from London home to emergency room . Comment: