Jessica Simpson baby 2 is a boy, the star accidentally confirms on Jimmy Kimmel show

Jessica Simpson has previously refused to reveal the sex of her unborn child, but she accidentally revealed that she’s expecting a baby boy during an interview on Jimmy Kimmel Live on Wednesday.

“The crazy thing is I never knew a wiener could make me nauseous,” Jessica Simpson told Jimmy Kimmel.

Jessica Simpson then laughed off the on-air mistake, saying: “Well I guess I just told the world that I’m having a boy!”

She didn’t seem worried by the slip up, tweeting: “Accidental announcement tonight on @jimmykimmel.”

Jessica Simpson, 32, fell pregnant with her second child when her daughter Maxwell was less than a year old.

The pop star and her fiancé Eric Johnson confirmed they were expecting their second baby back in December.

Jimmy Kimmel joked when greeting her that “It’s time to have this baby already,” to which Jessica laughingly said: “I know, I can’t believe I’m pregnant again!”

But this time around, being pregnant is more of a challenge, she said.

“It’s a totally different pregnancy. I just feel awful, I’ve been vomiting,” said the star candidly.

Jessica Simpson then cracked the wiener joke, after which she brought her hand to her mouth in shock at her accidental slip.

“I can’t believe I just did that, that was not planned,” she said good-naturedly. Later she said: “I just did it so crude, I feel awful!”

It’s been reported that Jessica Simpson and her fiancé plan to name their child Ace. When Jimmy Kimmel addressed the rumors, she didn’t answer him directly, stating: “Well let’s hope it’s a boy!”

Jimmy Kimmel also asked her whether she planned on getting married soon.

“I keep planning on getting married but I keep getting knocked up,” she quipped.

“Maybe I should go back to when I was younger – I was a virgin before I was married, so maybe I should just completely reverse and just stop having sex all together until Eric and I actually say <<I do>>.”

Jimmy Kimmel asked what Jessica Simpson’s father Joe Simpson, who is an ordained minister, said when his daughter got pregnant out of wedlock.

Jessica Simpson said when she told him she was pregnant the first time, he said: “Well what are we going to do?”

And the second time she fell pregnant, Joe Simpson was more resigned, merely stating: “Oh honey.”

When asked whether she and Eric Johnson plan on having more kids, Jessica Simpson stated: “I really don’t want to be pregnant again because this pregnancy is really rocking my world right now.”

Jimmy Kimmel also mentioned Jessica Simpson’s best friend Cacee Cobb, who is pregnant and due around the same time as Jessica.

When asked if the two had planned it, Jessica Simpson replied: “Well it’s definitely something we would love to have happened. We want our babies to be best friends, ’cause we are.

“So now we’re going to force them to go to school together, force them to eat sandwiches together.”

“Hopefully it works out, we would be heartbroken,” Jessica Simpson said, laughing.