- Source of Wealth: Property (18th Duchess of Alba)
- Birth Place: Liria Palace, Madrid, Spain
- Height: 1.63 m (5′ 4″)
- Weight: 73 kg (160.94 lbs)
- Marital Status: Married (Alfonso Díez Carabantes)
- Full Name: María del Rosario Cayetana Fitz-James Stuart y de Silva
- Nationality: Spanish
- Date of Birth: 28 March 1926
- Ethnicity: Spanish
- Occupation: Duchess of Alba
- Children: 6 (Eugenia, Cayetano, Carlos, Jacobo Lopez, Alfonso and Fernando)
The 18th Duchess of Alba de Tormes, Grandee of Spain, Cayetana Fitz-James Stuart, has an estimated net worth of $4.9 billion. When combined, her property is 170 times the size of Monaco.
But being such a wealthy and titled woman comes with pressures and the Duchess of Alba is a well-known socialite in Spain and is featured prominently on various television shows and in various media reports. She has been a tabloid fixture in Spain for decades. After losing her first husband Luis Martinez de Irujo in 1972, the Duchess spent time with a variety of eligible male matadors and flamenco dancers and eventually tied the knot with the much-younger Jesus Aguirre, an ex-priest. Now Cayetana has made headlines yet again for a third marriage. This time the Duchess of Alba and possessor of more aristocratic titles than anyone else in the world will marry Alfonso Diez, a 61-year-old civil servant, making the commoner the Duke of Alba. Diez is 24 years her junior.
She was born at the Palace of Liria on March 28, 1926, as the only child of Don Jacobo Fitz-James Stuart y Falcó, 17th Duke of Alba, and Doña María del Rosario de Silva y Gurtubay, 9th Marquise of San Vicente del Barco. Her godmother was Queen Victoria Eugenia of Spain.