The cat is out of the bag -- Jessica Simpson is having a boy!

Though she hinted at the baby's sex on "The Ellen DeGeneres," she accidentally let the gender slip while promoting "Fashion Star" on "Jimmy Kimmel Live!"

"I never knew a wiener could actually make me nauseous," she revealed while talking about how uncomfortable her second pregnancy has been so far.

Realizing what she just said, a shocked Jessica then exclaimed "Well, I guess I just told the world that I'm having a boy!"

Jimmy tried for more info -- like will she name the baby Ace, as rumored? -- but she kept coy.

This will be the first boy for Jessica and fiance Eric Johnson, who welcomed baby Maxwell last year.


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