Jessica Simpson is having a boy! The singer and actress accidentally announced the baby's gender on Jimmy Kimmel Live late Wednesday night. During the interview Simpson slipped that her daughter Maxwell Drew is getting a little brother.

"I just feel awful, I've been vomiting," she tells Kimmel of her current pregnancy. "The crazy thing is, I never knew that a wiener could actually make me nauseous."

Shocked at the accidental revelation Simpson spends the remainder of the interview in awe of her blonde moment.

"I can't believe I did that; that was not planned...I just did it so crude, too. That was awful. I'm talking about wieners," she later explains.

With their second child on the way, and Maxwell Drew only being born 10 months ago, Simpson and fiancé Eric Johnson may call it quits after two children.

"I really don't want to be pregnant again, because this pregnancy is really rocking my world right now," the Fashion Star judge and co-creator added on Kimmel.

Dressed in a black lace maternity dress from Simpson's own fashion line, the Dukes of Hazzard star also talked about how excited she was that her and her best friend, Cacee Cobb, are pregnant at the same time.

"We want our babies to be best friends, because we are," Simpson joked with Kimmel. "We're going to force them to go to school together, force them to eat sandwiches together. Hopefully it works out."

Watch the entire Jimmy Kimmel Live interview Jessica Simpson below: