That 37 page government filing came in just before midnight for his Chicago conviction.
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The prosecutors are hoping to keep Kelly in prison for life as they called him a serial sexual predator with no remorse.
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The sentence would add onto the 30 years Kelly is already set to serve for his New York case.
Prosecutors admitted 25 years for this Chicago case would be more time than sentencing guidelines recommend.
"It is a lot for this but obviously given the profile of the case... the notoriety of the defendant and the seriousness ...not just of these crimes but of all the crimes he committed," ABC7 Legal Analyst Gil Soffer said. "It's not shocking the government's made this request."
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In the 37 page filing prosecutors said, "The only way to ensure Kelly does not reoffend is to impose a sentence that will keep him in prison for the rest of his life."
Kelly's attorney has recommended a sentence of around ten years. She maintains Kelly is being singled out for behavior she said "white rock stars have gotten away with for decades."
"The real question is less exactly how many years the judge gives ,but either if it's going to be consecutive or concurrent ...because if it is consecutive to the sentence Kelly is already serving in New York then he's there for life for sure," Soffer said.
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R Kelly's attorneys did not return our request for comment. A judge will sentence him next Thursday in Chicago.