Princess

Princess Sigrid Vasa of Sweden (1566–1633)
Princess Benedikte of Denmark wearing insignia of the Order of the Polar Star (Sweden) and various Danish orders' insignia while in Stockholm, 2013

Princess is a title used by a female member of a regnant monarch's family or by a female ruler of a principality. The male equivalent is a prince (from Latin princeps, meaning principal citizen). Most often, the term has been used for the consort of a prince, or for the daughter of a monarch. A crown princess can be the heir apparent to the throne or the spouse of the heir apparent.