To be fair, they didn't exactly put the kind of budget into this example that they do into actual pop records. And they went with the first pretty teenage girl they could find. There are plenty of teenage girls in the world who are at least as pretty as that model and have the ability to sing (Auto-Tune is pretty limited--notice that the girl in the clip doesn't seem to effortlessly belt out her song the way Katy Perry can; even if you do have to be Auto-Tuned, it helps if you have some enthusiasm and volume you can pump into it). I don't know if they're as rare as we are led to think (though their market value suggests they are), but it's certain that natural talent isn't an overriding concern.