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Singer R. Kelly booked on child porn charges

Chicago attorney Ed Genson, left, and his client R&B singer R. Kelly, appear in court in Bartow, Florida, on Thursday

CHICAGO, Illinois (CNN) -- R&B singer R. Kelly posted $75,000 bond Friday and left a police station in Chicago, Illinois, after being booked on charges of child pornography.

Dressed in a suit, Kelly declined to talk to reporters and left the 10th District station in a private car. His next scheduled court appearance is June 26.

Kelly surrendered to Chicago police after he was picked up in Florida.

He was arrested Wednesday, hours after he was indicted by a grand jury in Chicago on 21 counts of child pornography, stemming from a videotape that police say shows the star performing sex acts with a 14-year-old girl.

The 35-year-old singer, whose full name is Robert Kelly, denies the allegations.

If convicted, Kelly could be sentenced to up to 15 years in prison and fined a maximum of $100,000.

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Authorities said an investigation was launched February 1 after the Chicago Sun-Times newspaper received an anonymous videotape along with a claim that the man in the video was Kelly. The paper turned the tape over to police, which then had its sex crimes unit investigate further.

Investigators interviewed more than 50 witnesses who went before the grand jury and identified the singer as the man in the video, authorities said. The FBI crime lab in Quantico, Virginia, authenticated the tape, they said.

Cook County State's Attorney Richard Devine said the grand jury indicted Kelly -- who is best known for his smash hit "I Believe I Can Fly" -- on seven counts of videotaping the sex acts, seven counts of producing the video and seven counts of soliciting or enticing the girl into having sex with him.

Authorities would not comment on the identity of the girl in the videotape. The Chicago Sun-Times said she was the then-14-year-old daughter of an associate of R. Kelly's, but added that the girl and her parents have said it is not her.