R. Kelly's attorneys Friday asked a Chicago judge to dismiss the child pornography case against the R&B superstar.
The defense team said the indictment, which says Kelly "knew" or "should have known" the girl he had sex with on videotape was under 18, could potentially confuse a jury.
The prosecution said the language was in line with child pornography laws.
Judge Vincent Gaughan said he would issue a ruling on the motion after the new year. The next hearing in the case is scheduled for Feb. 10.