Princess Elisabeth, Prince Gabriel, Prince Emmanuel and Princess EleonoreIt was back to school for King Philippe and Queen Mathilde’s children — Princess Elisabeth, Prince Gabriel, Prince Emmanuel and Princess Eleonore — on September 1, 2017. The Belgian monarchs’ kids posed for a group photo on their first day, which was shared on the royal family’s Facebook account with a message that read: "Back to school!"Princess Elisabeth, 15, and Prince Gabriel, 14, looked all grown up in the photos, coordinating in red. Elisabeth, who is first in line to the Belgian throne, wore a chic embroidered jacket, white top and jeans while her younger brother Gabriel looked smart in a red jumper and beige chinos. Photo: Facebook/BeMonarchie