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Diddy sexually assaulted a woman in a night club as she was celebrating her 20th birthday ... shoving his hand up her skirt and forcefully penetrating her with his fingers ... at least according to a new lawsuit.

The Bad Boy Records founder was just hit with a new lawsuit filed by his legal nemesis, Houston attorney Tony Buzbee . facebook.com/playhousehw

According to the suit, obtained by TMZ, a woman named Leiana Ripley says Diddy approached her at Club Playhouse in Los Angeles around November 1, 2016 and demanded she drink a beverage he offered her.

She says she declined at first but Diddy responded, "Bitch, I am not asking you. Drink that shit and shut the f*** up." She says she felt frightened and compelled to drink the beverage he "forcefully slid" towards her.

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