Oh, it absolutely exists! Right from an early age, children are attracted to the 'pretty' child and want to be their friend. Extra treats and compliments are given by strangers. Haven't we all stopped to admire a very cute toddler and had a positive interaction?
That attractive child grows more confident and outgoing because of the interactions, and is often the first one chosen for teams, group efforts. They grow with the pretty privilege, mostly without realizing it. There may be the odd one that will take advantage of it, but many grow up confident and popular.
I remember once, having won a wine tasting and tour at an upscale winery, I went with an attractive friend. Right from the start, the representative from the winery assumed my friend was the lucky one, and spent the whole tour directing conversation towards her, (even though she did correct him), she was served first at lunch, etc. While not unattractive, I am very average, and perhaps used to being part of the background.