Jay-Z's grandmother just reached a huge milestone, celebrating the event with her closest family and friends. Source: NurPhoto / Getty The music mogul honored his grandmother, Hattie White, with a lavish celebration for her 100th birthday. The celeb-filled bash took place in New York, bringing together all of the most important people in Hattie's life to celebrate such a huge milestone. The Roc Nation founder hosted the private gathering to honor the Carter family matriarch kicking off her century life celebration.