FILE - This March 13, 2019 file photo shows R. Kelly and his publicist Darryll Johnson, right, leaving The Daley Center after an appearance in court for Kelly's child support case in Chicago. Prosecutors in Chicago have charged Kelly with 11 new sex assault charges, some that are more serious than those first filed against him in February. The Chicago Sun-Times reported Thursday, May 30, on its website that the charges include counts that carry a potential sentence of up to 30 years in prison. The charges say the alleged offenses happened in 2010. (Ashlee Rezin/Chicago Sun-Times via AP, File)

FILE - This March 13, 2019 file photo shows R. Kelly and his publicist Darryll Johnson, right, leaving The Daley Center after an appearance in court for Kelly's child support case in Chicago. Prosecutors in Chicago have charged Kelly with 11 new sex assault charges, some that are more serious than those first filed against him in February. The Chicago Sun-Times reported Thursday, May 30, on its website that the charges include counts that carry a potential sentence of up to 30 years in prison. The charges say the alleged offenses happened in 2010. (Ashlee Rezin/Chicago Sun-Times via AP, File)

CHICAGO (AP) — Prosecutors charged R&B singer R. Kelly on Thursday with 11 new sex-related counts involving one of the women who accused him of sexually abusing her when she was underage, including counts that carry a maximum sentence of 30 years in prison, making them the most serious he faces.

Cook County prosecutors charged the Grammy award-winning singer with four counts of aggravated criminal sexual assault, two counts of criminal sexual assault by force, two counts of aggravated criminal sexual abuse and three counts of aggravated criminal sexual abuse against a victim who was at least age 13 and under 17 at the time.

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The four aggravated criminal sexual assault counts carry maximum terms of 30 years in prison. Kelly is due in court to hear the new charges next Thursday.

Kelly was already facing 10 counts of aggravated sexual abuse involving four women over roughly a 10-year period that started in the late 1990s. Three of the women were minors when the alleged abuse occurred.

The new charges pertain to a single victim, identified in the court filing by the initials “J.P.” Prosecutors didn’t specify in the filing if she is the same person as one of the original four accusers who was also identified as “J.P.”

R. Kelly’s lawyer, Steve Greenberg, told The Associated Press the 11 sex-related counts “are not really new.”

“They are the same conduct, just charged differently,” Greenberg said. “Same alleged victim, same timeframe, same facts.”

Greenberg has long said Kelly expected to prevail at trial and in his comments Thursday, he said he expects the “same results.”

Kelly pleaded not guilty to the original charges and denied any wrongdoing after his February arrest. He has been free since Feb. 25, when a suburban Chicago woman posted $100,000 bond, or 10% of the $1 million bond the judge set in his case.

According to the new court filing, the first eight counts are from encounters that allegedly occurred between Jan. 1 and Jan. 31, 2010. Three others pertain to alleged encounters between May 1, 2009, and Jan. 31, 2010.

Among other things, prosecutors allege that Kelly used force or threatened to do so to pressure the accuser into sex or to perform oral sex on him. She was underage at the time, extending the statute of limitations for bringing charges to 20 years from her 18th birthday, they wrote.

Kelly doesn’t face federal charges, but attorney Michael Avenatti told the AP on Thursday that he expects the singer to face “serious federal charges” in the coming weeks.

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Avenatti, who says he represents three Kelly victims, two parents and two whistleblowers, said he has provided “significant evidence” against Kelly to federal prosecutors in multiple U.S. attorneys’ offices. He said he and his clients have been cooperating with prosecutors “for the better part of four months.”

Greenberg said if Kelly ever does face federal charges, “we will deal with it.” But he said Avenatti isn’t a credible source for how the matter is unfolding.

“This man is accused of repeatedly stealing from his clients ... to fund an opulent lifestyle he hadn’t earned,” Greenberg said.

Avenatti, who said after Kelly’s arrest that he had turned over video to prosecutors showing Kelly having sex with an underage girl, faces federal charges , including ones accusing him of trying to shake down Nike and cheating his most famous client, porn star Stormy Daniels, out of $300,000.

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Associated Press writers Jim Mustian in New York and Caryn Rousseau in Chicago contributed to this report.

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Check out all of the AP’s complete coverage of the investigation into R. Kelly.