Life & Style reports that the singer and husband Nick Cannon are pleased to have discovered that they will welcome a baby boy and a baby girl later this year.
"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," she told the publication.
"There were fan contests on Twitter about what gender they are and rumors about them being two boys or two girls - but nobody guessed this!"
A friend of the couple added: "It's all about pink and blue these days.
"It's truly going to be a dream come true for them. They get a son and daughter."