What causes certain people to be naturally pretty (woman) or overly handsome (man)?

Many times they are exceptionally adorable, extremely cute even as babies. Then as a toddler and during their early childhood years, they're still cute. As they reach adolescence and then early adulthood, they grow into a real beauty model or very handsome man.

What causes certain people to be natural beauties? Is there some specific gene responsible for this? I understand the eye of beholder phrase, but there are certain people that are just universally attractive that we can't deny.

What causes certain people to be naturally pretty (woman) or overly handsome (man)?
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