Nick Cannon: Mariah Carey Sold Our House ... And I Had No Say In the Deal!

Nick Cannon got run over by the Mariah Carey express, because their business manager let her drive the train on the sale of their mansion ... while he was kept 100% in the dark ... according to Nick.

According to a new lawsuit ... Cannon says he never authorized the $9 million sale of the Bel-Air home he and Carey used to share, and believes biz manager Michael Kane was dealing exclusively with her people on the deal.