Princess Elisabeth marked a major milestone on May 28 as she officially became a graduate of Harvard University . Her parents, King Philippe and Queen Mathilde , made the trip from Belgium for the 24-year-old future queen’s celebrations—and Elisabeth borrowed a special accessory from her mom, Queen Mathilde, for an awards ceremony ahead of the graduation. On May 27, Princess Elisabeth toted a burgundy Lady Dior bag previously carried by her mother as she attended the Harvard Kennedy School's class of 2026 awards event. The classic quilted bag, which was named after Princess Diana , coordinated with Elisabeth's Maje slingback heels and the red flowers in her maxi dress. The royal chose Maje's $690 white silk design, pairing it with red cluster earrings by Bamboleira, with the shade honoring the red of the Belgian flag.…