It's lots of things for me: her being super petite is one of them, I just like that. And also that she's hot in a pretty normal housewife next door kind of way (when she's in character, of course not her Hollywood red carpet persona). But for me the answer is kind of in the question: "what...makes you guys so obsessed with her?" You guys. Plural. I'd be lying if I claimed I didn't just kinda get off on knowing that it's a shared fantasy, and feeding off the comments we all make. I mean, otherwise we're all just muttering into a void, right? Nice kind of feedback loop instead!
That's my own 2 cents on PH for now.