Judge Vincent Gaughan called attorneys into the courtroom, told them about the note but adjourned before dealing with the matter.
The judge said later that the jury had stopped deliberating for lunch.
Earlier in the morning, the judge called attorneys in to discuss a problem with another juror, who became frustrated by slow service during dinner and started banging a bottle on the table and cursing.
That juror was allowed to remain on the panel after other jurors indicated they could continue working with him.
Kelly has pleaded not guilty to charges that accuse him of videotaping himself having sex with an underage girl.