Transcript for America's Youngest Billionaire
tonight, she lives a secretive life. She's the face of a billion dollar break through and she's only 30 years old. Abc's abbie boudreau tells us about america's youngest female billionaire. Reporter: From animal style to a four by four. In-n-out burgers have cult status. With 281 restaurants in five states and 2.9 million facebook fans worldwide. But just like their secret ingredient -- what's in that souse, by the way? Much ash the chain's owner remains a mystery, until now. She's 30-year-old lynsi torres, recently outed as the youngest female billionaire in america. But who ? She is very secretive, as is the company. She's kept this very low profile. Reporter: In the 2010 documentary, california gold, the hamburger heiress gives a rare interview, talking ash teaching employees the values her grandparents build the company on. We started as a very small family, very small company. And, know, I like to bring that family atmosphere. Reporter: Here's the little we do know about torres. She inherited the burger empire at age 30. She's been married three times. A proud mommy of twins. And her unusual hobby? You can catch america's youngest female billionaire racing a car as much as 170 miles an hour. Reporter: As a private company, in-n-out's earnings are a secret, too. Though some estimates put them at $600 million a year. So, that's why torres could recently spring for this spraufling $17 million estate, complete with seven bedrooms, 16 bathrooms, a golf course, and, yes, a gourmet kitchen. A world away from the family kitchen she used to work in. You didn't do the potatoes, did you? Oh, that wasn't my strong point. I liked washing, but not dicing. Reporter: Abbie boudreau, abc news, los angeles.
This transcript has been automatically generated and may not be 100% accurate.