Ariana Rockefeller
Preppy doesn't even begin to cover it. Backed by the most American of American last names, short of Vanderbilt, Ariana's eponymous fashion line is all navy and white, tennis dresses, sailor stripes - you get the deal. While making the social rounds in New York, she keeps close to fellow equestrian lover Georgina Bloomberg, and husband Matthew Bucklin, President of The Quit Company (because that's a thing, apparently).
[Photo via @arianarockefeller]