Troubled singer Chris Brown admitted Friday to violating his probation and was jailed for a year in Los Angeles, though he was given credit for about eight months already served.

A judge also renewed Brown's probation and extended it through January 2015, after the star admitted breaching the terms of his release linked to his notorious assault five years ago on then-girlfriend Rihanna.

Brown, who is also facing legal action over an alleged attack in Washington DC, has been on probation since he admitted the eve-of-Grammys assault on Rihanna in February 2009.

The probation was first revoked last summer after allegations stemming from a car crash, but was reinstated in August when Los Angeles judge James Brandlin ordered him to carry out an additional 1,000 hours of community labor.

Brown, 24, and his bodyguard Chris Hollosy, 35, were then accused of punching a man last October outside a trendy Washington hotel after the singer rejected the man's request for a photo.

Back in California, he was arrested in March after being thrown out of a Malibu substance abuse and anger management center, reportedly after making remarks about guns and knives in a group therapy session.

While remaining in custody, he was transferred to Washington last month for hearings on last year's hotel fracas, but the case was postponed and he was returned to Los Angeles to face Friday's parole hearing.

Judge Brandlin sentenced Brown to one year in LA County Jail, but gave him credit for 234 days already served.

Brown is now due back in Washington for a status hearing on June 25. If convicted, Brown faces up to six months in jail there.

Brown, who is also a dancer and actor, won a Grammy for best R&B album in 2012.