An American media proprietor, talk show host, actress, producer, and philanthropist,Oprah Winfrey, 64, has emerged as the  first black woman to be listed in Bloomberg's Top 500 richest people in the world list, according to the Bloomberg Billionaires Index.

Oprah comes in at number 483 with a networth of $4.02 billion.

Since January 1st 2018, her networth has grown by over $420million.

Her latest boost in wealth comes thanks primarily to her investment in Weight Watchers. In 2015, Winfrey put $43 million in the company and got a 10 percent stake. It was the company's recent stock rally on June 12, which sent share prices to record highs, that tipped Winfrey's wealth over $4 billion.

She also recently announced a multiyear content deal with Apple reportedly worth $1billion.