The interwebs are ablaze with chatter that Jessica Simpson -- who just seven months ago birthed her first baby -- is "accidentally" knocked up again after a sperm apparently tripped and fell into one of her eggs.

At first we were all "doesn't she know how how babies are made?" and then we remembered who we're talking about here so never mind.

A source told Us Weekly, "It definitely wasn't planned. But yes, Jessica is pregnant again ... She really is overjoyed!"

This third-person account is a little weird since the new issue of Us supposedly has Simpson herself "sharing" the "unexpected good news," but whatever.

Assuming it's true, the tot -- due next summer -- will be the second child for both Simpson and her fiance, former NFL pro Eric Johnson. They had daughter Maxwell Drew Johnson on May 1 of this year.

It certainly puts a crimp in her multi-million dollar deal with Weight Watchers, but hey, she only promised them she'd lose the post-baby weight -- not that her ignorance of the human reproductive system would keep her from gaining it all back.

She's lost about 70 pounds now, so she's held up her end of the bargain (even if it involved a small fleet of people to make it happen).

And now we're thinking maybe she's not so dumb -- because if she goes all Michelle Duggar on us and starts treating her womb like a clown car, the income stream generated just from losing the weight after every baby could be enough to sustain her quite nicely.

Well played, Jessica. Well played.