Now what I'm about to say may sound like ramblings, and indeed it might be, but bear with me.
It seems to me that beauty and mathematics are heavily linked. Our perception of a beautiful piece of music quite often tends to have a wonderful mathematical symetry to it, Mozart's pieces for instance are so close to mathematical perfection that it's almost creepy. There's something in this mathetmatical consistency that resonates with our brain on some level. Further, people are generally considered more beautiful if their facial, and body symetry have a mathemetical consistency. That does not mean that there has to be perfect symetry, in fact we seem to prefer the flaws. We do not find square headed robots beautiful, even though their geometrical shapes are perfect. Nor do we find music that is "perfect" to be beautiful, without the flaws it's simple "too perfect".
Beauty however is a creation of our brain, without the perception of beauty there would be no beauty so to speak. Although we can in most likelyhood use mathematics as a general guide for beauty we also know that beauty can be "created". In certain social psychology theories (too lazy to find them atm, sorry), it is believed that familiarity can cause "love" and a perception of "beauty". Perhaps our brain is designed to find mathematical consistencies in everything around us, and through repeat exposure to people, shapes etc, we little by little find them more beautiful as time passes. Our brain could simply be desperate to find these consistencies, which could also explain why many consider "celebrities" to be more "beautiful" than ordinary folk (although in most cases they simply are ordinary folk).
It would make sense in my opinion that the tool we've decided is the most elegant and sophisticated form of understanding the world, mathematics, is also what guides our perception of beauty. At some level our brain chemistry responds to this mathemtical perfection (or near perfection).
Again sorry for the rambling :unsure: