The Spanish royal family attended the Solemn ceremony commemorating the 40th anniversary of the Spanish Constitution at Congress of Deputies on Thursday.
Queen Letizia looked regal in her bespoke red Carolina Herrera piped sheath dress.
She has now worn it on three occasions since its debut in September.
Queen Letizia supplemented the look with custom pieces by Magrit. She carried her red 'Kares' suede clutch bag and on her feet were the 'Ivonne' pumps.
Queen Letizia added a personal touch by wearing her mother-in-law's ruby and diamond dove 'Saudi' earrings.
They were gifted to Queen Sofia from the Saudi Arabian monarchy many decades ago. You may recall Letizia first wore them during the State visit to Japan in April 2017.