Floyd Mayweather could lose tens of millions of dollars from his big payday if his baby mama gets her way ... because she's just filed a lawsuit claiming he ruined her with lies to save his own ass.
Josie Harris, who has 3 kids with Floyd, claims he lied through his teeth in an interview with Katie Couric just 2 weeks before the big fight ... when he claimed Josie was in a drug-fueled rage and he had to "restrain" her during their infamous 2010 domestic violence incident.
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