10. CHRISTY WALTON
His net worth in 2011 was $26.5 billion compared to a net worth of $22.5 billion in 2010. She was born in the year 1955 and her full name is Christy Ruth Walton. She was married to John T. Walton and he was one of the sons of Sam Walton who was the founder of Wal-Mart. She inherited the fortune of her husband after his death. She happens to be the sixth richest person in the United States. She is also the richest woman in the world for seven years in a row. It is reported that Gina Rinehart who is into mining and comes from Australia might have exceeded her wealth this May but we are not certain about that.
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