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The Los Angeles County Sheriff's Department is investigating an allegation of sexual battery against Sean "Diddy" Combs ... but Diddy says he didn't do it.

The accusation comes from a male music producer and publicist who claims Diddy exposed himself and asked him to assist in a sex act back in 2020. Play video content

According to a police report filed in Largo, Florida ... the unidentified producer says he was invited to a photo shoot in Los Angeles where Diddy allegedly began masturbating under a shirt and asked the accuser to assist him in the act. The accuser claims he ignored Diddy's request, and the music mogul continued going about his business before tossing the shirt at him.

Jonathan Davis , a civil attorney representing Diddy, tells TMZ ... "As Mr. Combs’ legal t

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