TMZ.com reports that former Portland Trail Blazers forward Shawne Williams pleaded guilty to marijuana possession following an arrest in December.

Ex-NBA player Shawne Williams has pled guilty to possession of a controlled substance following his December arrest ... when cops busted him for smoking a blunt inside his Porsche.

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Following the arrest, Williams was charged with possession of a controlled substance (for the weed) and possession with intent to sell (for the codeine).

Williams pled guilty to weed possession today and was sentenced to one day in jail and a $500 fine. He was given credit for time served and has already paid the fee.