The millionaire twins have reportedly invested $2 million in their favorite bakery.
It's not the bakery's first brush with fame—Sweet Lady Jane's bakers have created wedding cakes for Jennifer Lopez, Bruce Springsteen and Carnie Wilson.
Mary-Kate and Ashley are said to be so involved in all aspects of their new business, they've even started coming up with cake ideas for Sweet Lady Jane founder Jane Lockhart, according to publication In Touch.