Jessica Simpson Let It Slip; She's Having a Boy

It's a boy! 

Jessica Simpson blurted out the news she didn't want the world to know, after Jimmy Kimmel asked how her pregnancy is going.  

"It's a total different pregnancy. I just feel awful. I've been vomiting. The crazy thing is, I never knew that a weiner could actually make me nauseous," said Simpson.

There it was—she let it slip.

"I guess I just told the whole world that I'm having a boy," said Simpson.

Kimmel laughed and replied, "Oh! Okay, I didn't even know what was happening."

Simpson also tweeted a picture of herself in a black mini dress looking a lot different than how she looked on Kimmel's show one year ago, pregnant with daughter Maxwell.

She said, "I just outed I'm having a boy, right? I can't believe I did that. That was not planned."