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New York Knicks star J.R. Smith was arrested in South Beach last night ... after cops discovered the 26-year-old was a wanted man.
According to reports, Smith was pulled over on a routine traffic stop ... when the officers noticed an active warrant out for Smith's arrest stemming from his failure to address a ticket for driving without a valid license.
Smith was booked into Miami-Dade County jail shortly before midnight. He was released a short time later on bond.
Calls to J.R.'s agent have not been returned.