Beyoncé isn’t letting her pregnancy keep her at home. The mom-to-be spent a busy day at Mercedes-Benz Fashion Week, checking out the spring 2012 designs from J. Crew, Vera Wang, and Rodarte with her sister Solange. Later in the evening, she celebrated the release of music mogul Steve Stoute’s book The Tanning of America with Jay-Z, Alicia Keys, and Diddy, before heading to the opening of Tory Burch’s Madison Avenue flagship store. A glowing B smiled for photos in a black cut-out gown while mingling with stars including Serena Williams, Estelle, and Lucy Liu.