The Amazing Change of Princess Leonor, the Future Ruler of Spain

Until 2014, the status of being just an Infanta was held. However, upon Felipe's ascension, the proclamation of Heir to the Throne was made, coinciding with the acquisition of the title Princess of Asturias. This title is akin to the Prince/Princess of Wales title for the Brits, as it designates the individual next in line for the crown.

Additionally, the titles of "Princess of Girona and Princess of Viana" were also assumed, representing the firstborn of the Kingdom of Castile, the Throne of Aragon, and the Kingdom of Navarre, whose union constituted the Spanish Monarchy in the 16th century.