The Grammy Award-winning singer phoned into her husband's Rollin' with Nick Cannon US radio show today when she revealed she has been busy working through her pregnancy.
She said: 'Right now I feel nauseous, I'm exhausted.'
Mariah, who is currently promoting her new album Merry Christmas II You, is planning to stop working after the holidays.
The 41-year-old said: 'I guess after New Year's.'
Since she broke the news her and Cannon, 30, were expecting a baby, Mariah has cut herself off from the world.
She added: 'I didn't even look and see who contacted me.'
This Christmas Nick and Mariah plan on having big festivities because they have 'lots to celebrate'.
The singer added: 'We definitely, most certainly do.'