Pete Doherty pleaded guilty to a drug charge Tuesday after arriving so late the judge had issued an arrest warrant.

The 28-year-old rocker, who arrived in court at midday, also pleaded guilty to failing to appear on time without a reasonable excuse.

He admitted possessing quantities of crack cocaine, heroin, cannabis and ketamine as well as to two driving offenses on May 5.

The judge didn't immediately rule on the disposition of Doherty's guilty pleas.

Doherty, leader of Babyshambles and the boyfriend of supermodel Kate Moss, has been undergoing drug treatment under court order because of previous convictions.

His lawyer, Sean Curran, was summoned to court twice to explain Doherty's whereabouts before the judge's patience ran out.

"This is a court of law. He should have been here at 9:30 and he wasn't so I am issuing a warrant with no bail," said District Judge Davinder Lachhar.

Curran told the judge that Doherty had "a difficulty in his personal life which led to him being caught in this situation where he was driving the vehicle," but didn't elaborate.

The lawyer said it would be in Doherty's best interest not to drive, but the judge interrupted: "I am more concerned about the danger to other members of the public on the road and to pedestrians."