Jennifer Lopez might want to think twice about handing Casper Smart the keys to her Bentley ... 'cause her BF just pleaded no contest in a drag racing case.
Casper's high speed bust came back in April 2010 -- long before his J.Lo days -- and today an LA County Superior Court judge hit him with 12 months probation and a $500 fine.
Casper wasn't required to be in court ... his attorney entered the plea. We're guessing speed racer had better people things to do.
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