Infanta Sofia, 18, joined her parents, King Felipe and Queen Letizia, and sister, Princess Leonor, at a National Day reception at Zarzuela Palace.
The younger daughter of the Spanish monarchs made her debut, proving she is ready for her life in the royal spotlight.
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Meanwhile, Prince Edward, the Duke of Kent, marks his 90th birthday, a poignant day following the death of his wife, the Duchess of Kent.
Author's summary: Infanta Sofia debuts at National Day reception.