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The pop superstar tells the publication, "Even before we announced it was twins, I was trying to keep everything gender-neutral because I didn’t want to impose an identity on them too soon.
"There were fan contests on Twitter about what gender they are and rumours about them being two boys or two girls - but nobody guessed this!"
Mariah Carey's husband Nick Cannon revealed the couple was expecting twins in December (10).
The babies are due in April (11).