Amy Winehouse has died at her London, England apartment.
The Press Association reports the 27-year-old was found dead around 4 p.m. GMT (about 11 a.m. EST), and her cause of death is yet unknown.
Winehouse was seen on earlier this week when she appeared at a show her goddaughter Dionne Bromfield's show at London's iTunes Festival.
Earlier today, Winehouse's manager tweeted that the singer was putting all upcoming performances on hold.
"Everyone involved wishes to do everything they can to help her return to her best and she will be given as long as it takes for this to happen," Tim Gatt wrote.
Winehouse struggled with drugs and alcohol problems throughout her career, and had been sent back to rehab as recently as May. She was forced to cancel a European tour following a show in Belgrade, Serbia this June when she appeared on stage so drunk she couldn't sing.
The singer's drinking had reportedly gotten worse in recent months, with friends telling Britain's The Sun that they worried she was drinking herself to death.
"Her drinking is totally out of control," a friend told the publication. "Amy is constantly out of control on vodka.
"She is rattling about home in north London drinking herself into oblivion. Three times this week she has been so drunk she passed out."
The Daily Mail reports that it's thought her father, Mitch Winehouse, may not know about her death yet because he's en route to the United States to perform at a jazz festival.
Winehouse had a previous near-death experience, when she "died" in ex-husband Blake Fielder-Civil's arms during a drug overdose.
Winehouse will be remembered most for 2007's massively successful Back To Black album, which featured the mega-hit "Rehab," and her Frank debut album.
With her death at age 27, Winehouse joins the so-called "27 Club," including Jim Morrison, Jimi Hendrix, Kurt Cobain, The Rolling Stones' Brian Jones, Janis Joplin