Crown Princess, (擁王位繼承權的)公主

ベルギー王女、18歳の祝賀行事 “早めの戴冠式”全閣僚が出席
https://www.47news.jp/4147646.html

Belgium's Crown Princess Elisabeth poses with dancers and youth after a ceremony on the occasion of her 18th birthday, outside the Royal Palace in Brussels, Belgium on October 25, 2019. (Photo by Yves Herman/Reuters)
The Day in Photos – October 27, 2019
https://avax.news/pictures/352755