R. Kelly's persona non grata in Baton Rouge ... his "key to the city" there has been rescinded by the very same official who bestowed him with the honor.
Kelly was given the honor back in February 2013 by Denise Marcelle, who, at the time, was a member of Baton Rouge Metro Council. Marcelle tells us after Kelly's guilty verdict, she regrets giving Kelly a key to the city in the first place and is going to rescind it.
If you're wondering how that works, the process doesn't include actually physically taking the $256 plaque and key back from the singer ... but he's stripped of the honor.
Obviously, there were allegations against Kelly when Marcelle presented the key to him back in 2013, but she tells us she only knew he had been acquitted in 2008, and didn't do her homework to truly understand what was leveled against him.
Marcelle now serves as a member of the Louisiana House of Representatives, and not in the BR Council, but a rep for BR tells us Marcelle still holds the power to rescind the key since she was the one who gave it out.
As we reported ... Kelly was found guilty earlier this week on all counts in his federal sex crimes trial.
The jury didn't need all that long to deliberate ... beginning Friday afternoon and needing only half the day on Monday to reach its verdict on 9 federal counts ... including racketeering, sex crimes, human trafficking, obstruction of justice and kidnapping.