Pete Doherty [File photo]

A tabloid newspaper has published pictures of troubled rocker Pete Doherty in prison - and alleges the star is taking heroin while incarcerated.

The Babyshambles rocker was jailed for 14 weeks last Tuesday for "breach of time-keeping, non-compliance of his (probation) order and using different drugs".

But The Sun newspaper claim the star jail stint has not stopped his drug-taking ways, claiming the star is increasing debts to "buy" heroine from fellow felons at London's Wormwood Scrubs prison.

The publication has printed pictures of the musician in his cell, wearing a t-shirt and tracksuit bottoms, and talking to other convicts in a relaxed fashion.

A spokesman for the prison says, "We will act on any intelligence which indicates drugs are being smuggled or abused."