Mariah and Nick's daughter, Monroe, or Roe, was born on April 30, 2011, which also happened to be the couple's third wedding anniversary. Monroe's name is inspired by Marilyn Monroe, whom Mariah admires. Roe doesn't have a middle name, which was a conscious choice made by Mariah, as she doesn't have one herself.
It appears as though Monroe is a big supporter of Mariah flexing her high-note range, as evidenced by an adorable TikTok video featuring Monroe lip-syncing over Mariah's singing. We already know both twins are great backup singers, so only time will tell if Monroe or her brother follows in their mama's musical footsteps.