(AP Photo, 01-24-12)
I've already written about how easy it is to mix up Callista and Callisto, Jupiter's fourth Galilean moon, but perhaps the resemblance between her hairdo and a spherical orb is intentional? Because Newt is really, really into the moon. It could explain the spherical nature of his own coiffure, come to think about it. He's just so INTO it! Maybe even the similarity of Callista's name to that of a moon's attracted him to her in the first place! Oh, I could go on and on.
There are other theories, of course. My favorite one (thanks for the tip, Pony Pal™ Todd!) is that eventually Callista will move, mollusk-like, to a bigger shell.