Christy Walton is an American billionaire heiress who has a net worth of $36.7 billion. As of January 2014, Christy Walton is the richest woman in the world. Christy Walton was the wife of the late John T. Walton who was the son of the late WalMart founder Sam Walton. Christy and John had one child together, a son named Lukas. After the death of her husband John, Walton inherited his fortune of $15.7 billion dollars made up mostly of Walmart stock.