The website claims a "huge amount of money" is being sought for missed payments as well as the aforementioned breaches.
"Mariah owes Stella tens of millions in commission," a source in Stella's camp told DailyMail.com.
According to Forbes, Mariah earned $27m in 2015, the year she signed with Stella.
"She made next to nothing the year before that," the insider said, adding Mariah had earned around $100m in her three years with Stella.
Mariah hired Bulochnikov, a former stand-up comedian, in 2013 as part of a huge team shake-up. They were considered "inseparable" for around four years, but Mariah and Bulochnikov parted ways around a year ago.
A rep for Mariah said: "If this frivolous and baseless claim is filed, we will defend against it vigorously and successfully."