LONDON (AP) - Rock musician Pete Doherty has been released from a London jail after serving a partial sentence for breaking his probation.

The Babyshambles frontman's has served 29 days of a 14-week sentence. It is not immediately clear why he was released early.

Doherty's drug use has frequently landed him in court. Last year, he pleaded guilty to possession of crack cocaine, heroin, ketamine and cannabis, as well as a variety of driving offenses.

His recent jail sentence stemmed from the singer reportedly being late for several probation appointments.

Doherty, released Tuesday morning, is best known as the ex-boyfriend of model Kate Moss.