The 'We Belong Together' singer welcomed twins Moroccan and Monroe with husband Nick Cannon in April but confessed that she was plagued with negative feelings about her size in the final months before giving birth.
Carey, who recently became a Jenny Craig spokesperson as she attempts to shed her baby weight, said on Tuesday that she hid her body from Cannon as she could not let him see her at her heaviest.
"I had a towel on in the tub. I'm not lying, I promise you! You think I would let Nick see me looking rancid like that?" she explained, according to People.
Carey has estimated that she has lost 70lbs since giving birth, but said that she is unsure how much weight she actually gained during the course of her pregnancy as she was afraid to step on the scale.
"I didn't want to know, because why would I want to feel that bad? I know it was a number that I never want to see again. I had, like, no bones for a while," she said, gesturing to her collarbone. "It's important to me to feel my bones!"
Carey recently claimed that her new diet plan has her feeling better than ever.
Watch Mariah Carey's first Jenny Craig commercial below: