Kelly, 40, whose real name is Robert Kelly, faces up to 15 years in jail if convicted of videotaping himself having sex with an underage girl.
The underground videotape has been widely circulated.
Prosecutors have said the girl could have been as young as 13, but defence attorneys have disputed her age and whether Kelly is on the tape.
Kelly has pleaded not guilty to the charges and in the interim has released hit songs, gone on tours and released a DVD set of "hip-hopera" skits.
Cook County Judge Vincent Gaughan said jury selection would begin September 17.
The trial has delayed, in part, by arguments over when the video was made.
It was also pushed back because the judge fell and broke bones and needed to recuperate. © 2007 Australian Broadcasting Corporation
