50 Cent was arrested in St. Kitts in the Caribbean Saturday night … for using a word that’s apparently illegal there: “motherf*****.”

Sources tell TMZ, 50 (real name: Curtis Jackson) had been warned not to use profanity during his performance in front of 40,000 people. We’re told the DJ didn’t have a clean version of his set, and 50 didn’t pull the mic away from his mouth when he roared, “motherf*****” — and that was enough to get him arrested.

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Cops showed up after the performance and took 50 to the station, where he was booked for using profanity in public. It’s a minor offense, but he has to stick around until Monday, when he’ll go to court and pay a fine.

The same thing happened to DMX in 2003.

According to the Royal St. Christopher and Nevis Police Force’s Facebook page, 50 was granted bail but had to surrender his travel documents until his court appearance. Additionally, a member of the rapper’s entourage, Bajar Walter, was arrested for making use of indecent language and obstruction. He will appear in court on the same day.

•Photo shows 50 Cent.