Ashley and Mary-Kate Olsen currently reside in New York City and are rarely ever spotted. The 31-year-old twins live a very private life and usually only attend public events such as the Met Gala and formal charity affairs. At just six months, they began their start in what would soon become a billion dollar empire. Here's how:

"Full House" (1987-1995) - Six months to 9-years-old, fraternal twins Ashley and Mary-Kate Olsen shared the household famous role of Michelle Tanner on the ABC Sitcom "Full House." The show went on for a successful eight seasons and won five major awards.

Dualstar Entertainment Group (1993-present) - Two years before the show ended, the Olsens created and began co-owning Dualstar Entertainment Group, which was set up by their manager, Robert Thorne. The company produced all of the Olsen's iconic films and television series. A year after the launch, "The Adventures of Mary-Kate & Ashley" debuted a widely profitable series of musical mystery videos followed by a collection of children's books and games. The duo's famous motto was "will solve any crime by dinnertime."

The sister act went on to star in over ten films including "Double, Double, Toil, and Trouble," "It Takes Two," "Billboard Dad," "Passport to Paris," and "Holiday in the Sun." In the midst of all movies, they had three major TV series once Full House officially ended on the ABC network. The shows were "Two of a Kind", "So Little Time" and the animated series "Mary-Kate and Ashley in Action".

After appearing in numerous different cameos including "The Simpsons" and "Weeds" and filming their last movie together, "New York Minute," the Olsen's put acting on hold and decided to go head first into the fashion industry. Under the Dualstar umbrella, Ashley and Mary-Kate launched an array of fashion brands that all began with a namesake line of fragrances, make-up and even toothpaste. Today, the combined Olsen fashion empire is estimated at over a billion dollars.

According to a Telegraph report, at 10-years old, the sisters became the youngest self-made millionaires in American history and were handed control of Dualstar on their 18th birthday, making them among the richest teenagers in the world.

The Row (2006-present)- After the success of launching affordable clothing lines with Wal-Mart and J.C Penny, The Olsens started The Row as a personal project in 2005 with the challenge of creating the perfect t-shirt. A year later, they created a 7-piece couture collection made up of luxury basics that were first bought by Barneys New York. The success of their high-end label lead them to win a total of four CFDA awards at the highest honor a fashion designer can receive.

Elizabeth and James (2007-present) - With the success of The Row, the sisters tapped into the contemporary market and created the chic clothing and accessory line, Elizabeth and James, named after their younger siblings. Sold across major retailers such as Nordstrom, Bloomingdales and high-end stores like Intermix, the line is inspired by their iconic personal wardrobes and vintage finds. In 2016, WWD reported that Elizabeth and James's apparel generates between $40 million and $50 million in wholesale volume, while their fragrance called Nirvana account for $18 million at retail in Sephora.