The singer appeared in court and, while his mother and several friends and supporters looked on, he admitted committing a crime in Washington in October.
Superior Court Judge James R. Brandlin sentenced Brown to serve a year in county jail, but gave him credit for nearly eight months of time served. The credits include time the Grammy winner has spent in rehab and jail, as well as credits for good behaviour while behind jail.
His admission came in a felony assault case filed after Brown attacked pop singer Rihanna hours before the 2009 Grammy Awards. The pair was dating at the time.
Brown has been in custody since mid-March, when he was arrested after being dismissed from a court-ordered rehab sentence.
He faces a misdemeanour assault charge in Washington after a man accused the singer of hitting him outside a hotel in the nation's capital.
Brandlin said Brown will have to complete the remainder of his 1,000 hours of community labour sentence once he is released from jail.
Brown will remain on probation until Jan. 23, Brandlin ordered.
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