6:38 AM PT -- 50 Cent thanked fans for sending prayers Jeremih's way. The rapper also gave a brief update on the singer ... saying in a Sunday tweet, "he is responsive today, doing a little better."
1:04 PM PT -- Sources close to the situation tell TMZ ... Jeremih is currently on a breathing ventilator within the ICU he's being treated at, and we're told his condition has recently gotten worse.
Jeremih is fighting for his life, battling COVID-19 -- he's currently hospitalized in the ICU and the prognosis is bleak ... sources tell TMZ.
Sources with direct knowledge tell us the R&B singer is being treated at a hospital for COVID-19. It's unclear how long he's been admitted, or how long he's had the virus ... but he is not doing well.
Word that he was seriously ill started percolating online Saturday -- with rappers like 50 Cent, Chance the Rapper, producer Hitmaka and others asking for prayers on Jeremih's behalf, but not necessarily saying what exactly was wrong with him at first.
Fitty was the only one who gave a bit more insight, claiming it was COVID-related -- while also saying Jeremih was hospitalized in his native city of Chicago.
50 wrote, "pray for my boy Jeremih he’s not doing good this covid s*** is real." He added, "he's in ICU in Chicago."
Please if you can take a second to pray for my friend Jeremih, he is like a brother to me and he’s ill right now. I believe in the healing power of Jesus so if you can for me please please say a prayer over him
Chance also touched on the seriousness of the situation, writing ... "Please if you can take a second to pray for my friend Jeremih, he is like a brother to me and he’s ill right now. I believe in the healing power of Jesus so if you can for me please please say a prayer over him."