The wife of a crown prince; a formal title used in monarchies.
The crown princess actively participates in charity work.
王太子 means crown prince, while 王太子妃 specifically refers to his wife, the crown princess.
皇太子妃 is used for the crown princess of an empire (e.g., Japan), while 王太子妃 is for a kingdom.
Compound of 王太子 (crown prince) and 妃 (princess, consort).