Nick Cannon and Mariah Carey are collectively worth $515 million. Between the two of them, Nick Cannon himself is worth $15 million while Mariah Carey is worth $500 million.Cannon married singer Mariah Carey on April 30, 2008, at her private estate on Windermere Island in The Bahamas.Carey gave birth to fraternal twins on their third wedding anniversary, April 30, 2011 They named their daughter Monroe (after Marilyn Monroe), and named their son Moroccan Scott, because Cannon proposed to Carey in her Moroccan-style room; Scott is Cannon’s middle name and his grandmother’s maiden name. Monroe, like her mother, has no middle name.