As you probably know by now, Jessica Simpson is pregnant again, but it's totally not her fault. Her egg was just sitting there minding its own business when fiance Eric Johnson's sperm rudely decided to inseminate it without even asking.

And that's how babies are made. Thanks, Jess!

The second time mom-to-be told Jay Leno last night (Jan.15) that she's had two separate wedding dates that have had to be postponed due to pregnancies. The fault of which lies squarely on her beau.

“He keeps knocking me up,” Simpson joked. “I'll just keep my legs crossed, I guess, next time.”

Simpson also blamed some divine intervention, saying that while she didn't plan to get pregnant again so soon after her first child, "it was a part of God's plan for my life.”

The Weight Watchers spokeswoman -- who famously gained 50 pounds during her last pregnancy and later lost it with a hired brigade of assistants -- admits she used her occupied womb as a license to eat but won't do it again, adding, "I didn't realize you could gain that much weight that quickly."

Now that she knows sex causes pregnancy and eating causes weight gain, we can't wait to see how those revelations are handled on her new sitcom.