Nicole Richie’s lawyer forced yet another delay in court Tuesday of her pending DUI trial.

“The trial will not happen (Wednesday)” as scheduled, said Jane Robison, spokeswoman for the Los Angeles County District Attorney’s Office. “Richie’s attorney filed a motion … stating that their key witness, a drug expert, was unavailable for trial.”

Although Los Angeles County Commissioner Steven Lubell denied Richie’s attorney’s request for a new trial start date of Aug. 5, he ordered both sides to court Wednesday to argue over why the trial should be postponed again. Regardless of the outcome, the hearing postpones the trial at least a day, Robison says.

Richie does not have to attend the trial. She has reportedly traveled to Canada to watch boyfriend Joel Madden’s band Good Charlotte peform Tuesday night in Calgary.

Richie’s lawyer did not respond to requests for comment.

Source: People.com