jesssimpNYmag.jpgRuven Afanador/New York Magazine

Forget music and movies - J. Simp is making her money in the fashion world!

The former pop star and her fashion empire earned a whopping $750 million in 2010 and, as she expands her collection this year, is expected to earn $1 billion by the end of 2011, according to a new article in New York Magazine.

"I never thought I'd be some fashion mogul," Jess tells the mag. Simpson is currently engaged to former NFL player Eric Johnson.

"It was a complete shock, a beautiful shock," she says. "It felt great for somebody to be on his knee and I had to sit on that knee because I was so excited and overwhelmed. I couldn't even stand. Knowing that I had his knee to sit on in that moment was very magical. The way I always wanted it to be."