Conchita said she had been receiving medical treatment for years.
Bearded diva Conchita Wurst has said she is HIV positive and has been living with the virus for many years.
The Austrian drag queen, who won the Eurovision Song Contest in 2014, said on Instagram on Sunday that she had been blackmailed by a former friend who wanted to publish the information, and decided to come out herself with it before he did.
Conchita wrote that she had been receiving medical treatment for many years and that she was feeling healthy and strong.
Conchita, the alter ego of Thomas Neuwirth, wrote that “coming out is better than being outed by a third party”.
She said: “I hope to encourage (others) and make a step against the stigmatisation of people who through their own behaviour or through no fault of their own were infected with HIV.”