The judge in his case, Davinder Lacher, had spared Doherty a custodial sentence last year and gave him four weeks to prove he could stay off drugs after he was found in possession of crack, heroin, cannabis and ketamine.
The singer's extensive criminal record includes assault, possession of a flick-knife and numerous driving and drug offences.
But yesterday Judge Lacher's patience ran out, and she sentenced Doherty to 14 weeks in jail for repeatedly flouting the conditions of his probation order.
Yesterday, a source at the court confirmed that Doherty, the former boyfriend of Kate Moss, was jailed for "breach of timekeeping, unacceptable behaviour, non-compliance with his probation order and using different drugs".
Doherty's long-serving lawyer, Sean Curran, said the singer accepted the court's sentence.
He added: "Pete Doherty attended court today on a summons for breaching a condition of a suspended sentence imposed last October.
"He admitted the breach – he had missed two appointments and the judge has rescinded the conditions and has reactivated his suspended sentence, although has reduced it slightly to 14 weeks.
In Pete's defense he probably thought that since he got out of going to jail all those other times, that yesterday would be no different. Hopefully he will use his time to clean up his act, but I doubt it.
