I saw this thread title and thought to myself, Chef actually watches that crap?!?! Thanks for restoring my faith in you. (Well, a little bit, anyway.)
Here's the deal (from my mom, who actually DOES watch that crap): J+K already had twins, went back for more, and ended up with sextuplets. So it's a "reality" show about eight anklebiters and their overworked parents ... who, by the way, make $75K/episode and have an off-camera staff to cook, clean, and help babysit.
Trouble is, Kate matches her namesake from "The Taming of the Shrew" for sheer bitchiness, and Jon has apparently retaliated by finding other companionship. Will they divorce? You'll probably have to wait for sweeps week for that episode.
As to "why do people care"? That, I can't answer -- heck, I couldn't take more than five minutes of the show before excusing myself to another room.