Knox and Vivienne Jolie-Pitt are the youngest of Angelina Jolie and Brad Pitt’s six children. Angelina gave birth to the twins by C-section in 2008. Their older siblings Maddox, Pax, and Zahara were adopted, and Shiloh, born in 2006, was Brad and Angelina’s first biological child. Photo by Backgrid. Knox and Vivienne were photographed this weekend at the Last Bookstore in Los Angeles. Knox, 17, showed up with a fresh bruise near one eye and a he…