Nicky Hilton

While she might not be as well known as her sister, Nicky Hilton has also achieved success as an American socialite turned businesswoman, model, and fashion designer. Nicky also has the same inheritance deal as the other Hiltons and her sister Paris.

However, Nicky married James Rothschild, who happens to be one of the wealthiest families in the world. It has been said that the Rothschild family possessed one of the largest family fortunes in the world during the 19th century, and it is estimated that her husband has a net worth of about $1.5 billion.