AP Photo/Danny Johnston
Her net worth tops $38 billion.
The 67-year-old is worth an estimated $38.4 billion.
Walton was previously the second-richest woman - and 18th richest person - in the world, until the recent death of Liliane Bettencourt, the French heiress of cosmetics giant L'Oreal.
The three Walmart heirs have a combined wealth of $130 billion - about $48 billion more than the Kochs, the second richest family in the America.
Despite the Walton's high status, their personal lives remain largely private. Scroll through to find out what we know about how the world's richest woman spends her fortune, from collecting expensive art to breeding horses.