Kudos to Tory Burch on becoming a billionaire. The fashion designer extraordinaire has built quite the empire and her efforts have paid off…big time! According to Forbes.com, Burch’s company is now worth an estimated $3.25 billion, which values her 28.3% stake in the brand at $1 billion. The 46,year-old, University of Pennsylvania grad joins an elite group of fellow female self-made moguls like Spanx’s Sara Blakely, Meg Whitman, and Oprah Winfrey, who frequently chooses Burch’s designs as part of her “favorite things.”  Thanks to her chic Upper East Side aesthetic and ability to sell Reva flats to the masses, Tory continues to be an exceptionally stylish tycoon.