Mariah Carey's ex-manager to file a lawsuit because singer is always naked in her presence

Mariah Carey's former manager is suing her claiming she was repeatedly sexually harassed by the singer, who constantly go naked in front of her, but Mariah calls the allegation "baseless."  

Stella Stolper filed docs putting Carey's team on notice a lawsuit is coming. TMZ is told Stella is claiming Mariah rarely wore clothes around her, and was not only naked but did sexual things in Stella's presence.  

They are told Stella will also allege Mariah has a substance abuse problem, and fails to take her meds for bipolar disorder.  

Just last week, Mariah revealed she was diagnosed with bipolar disorder in 2001, but Stella's claiming that's just a small part of her problems.  

Further, Stella will claim she was unfairly fired in the middle of her 3-year contract, and is still due to a ton of cash.  

She's giving Mariah an opportunity to make things right, before the lawsuit is filed.  

A rep for Mariah tells TMZ, "If this frivolous and baseless claim is filed, we will defend against it vigorously and successfully."

See trouble....  Americans like any opportunity to get money and fame out of people.