Stella claims she was repeatedly sexually harassed by the singer because Mariah was constantly naked in front of her and did sexual things in her presence.
Stolper was dismissed by the pop last fall and, TMZ reports, is claiming she still hasn't been paid "a large sum of money" for her services.
Carey hired Stopler, who had previously been a standup comedian, in 2013.
You may recall that Mariah left Stolper to sign with JAY-Z's Roc Nation management and music publishing company in November.
Mariah Carey is reportedly being sued by her former manager.More news: Jose Mourinho savages Manchester United players after West Bromwich Albion humbling
Reps for Mariah told Metro.co.uk: 'Stella Bulochnikov was terminated from employment as Mariah¹s manager due to failure to perform her job effectively and ill-serving her client.
"Filing in NY was a shot across the bow to Mariah", O'Donnell tells The Blast, adding that Mariah fired Stella without cause while she was under contract. Stopler's also claiming that Mariah Carey also has issues with substances.
Stolper, a former comedian, became Carey's manager in 2013 and served in that role until previous year when they parted ways when Carey signed with Roc Nation.
Mariah Carey has thanked fans for their "uplifting" support, after announcing that she was diagnosed with bipolar disorder in 2001. "It's not making me feel too exhausted or sluggish or anything like that".
Talking to People magazine, Mariah explained that while her diagnosis came more than 15 years ago, she didn't seek treatment for the disorder until 2016.