"The allegations include child pornography, seduction of a minor and obstruction of justice," said Public Prosecution spokesperson Joseph Fitzpatrick, adding that more details would be released today.
The charges were filed in a federal court in the northern Illinois district.
It is the second time this year that the American singer is arrested on charges of sexual crimes. In February, he was formally charged with 10 aggravated sexual abuse crimes involving four victims, three of whom were minors at the time of the events.
At the time, R. Kelly declared himself innocent and was released on bail.