With a new fiance, a holiday album and news that she is on her way to becoming a billion-dollar mover and shaker in the fashion world, Jessica Simpson is on top of the world these days. "Things are going great for her right now," says a source close to the singer. "She's in a really good place now."

Indeed, Simpson graced the cover of WWD on Dec. 6, with the headline, "Jessica Simpson: Fashion's Billion Dollar Baby."

The Jessica Simpson Collection, it turns out, has become one of the most successful celebrity fashion lines of all time, according to WWD. It will most likely become the first ever to earn more than a billion dollars in retail sales, considering her line brought in a whopping $750 million in retail sales this year alone, WWD reports.

Simpson's estimated net worth from all the shoes, clothes and accessories she's selling? A cool $100 million. Not bad for the gal who famously wondered if tuna was chicken on her hit MTV series 'Newlyweds,' with ex-hubby Nick Lachey.