Haha...do you think her dermo would be invited over her pedi? I don't. Why in the world would you just invite a doctor because s/he was a doctor? Doesn't happen. You'd probably invite him/her because the two of you got along on a personal level, and had a good relationship. No specialty will guarantee that, because it isn't something you can teach in a residency.
And for that matter, most plastic surgeons work on middle-class and non-distinguished people as well. And pediatricians do far more than treat runny noses - if you think a husband would come to thank a p.s. for a good augmentation, how grateful do you think a family would be for a pedi saving a kid's life?
Dermatologists do all things skin-related...acne, grafts, rashes, and other things in that range.