The 45-year-old Spanish royal was all smiles as she arrived to the event as she met with pupils and school officials.
Letizia wore a pair of grey check cigarette trousers with a white silk pussy bow blouse to the event, which she teamed with a pair of black stiletto heels and a red shoulder bag.
Her look was completed with a nude lip gloss and a natural curl in her hair.
After meeting with the school’s governors and the heads of departments the Queen was then shown around the school.
The Spanish royals attended the occasion without her husband King Felipe VI by her side, but took the reigns and greeted both members of the school and pupils with hugs and smiles.
During her visit, Letizia took the time to speak to pupils and joined in with their lessons.
The former journalist chose to wear a midi length dress with cap sleeves for the event, which had a tiered skirt and black waistband.
The pattern on the frock was made up of black and white lines which caused an unexpected optical illusion.
In photographs, the lines on Letizia’s dress appear to bend in different directions.
Famous for her skyscraper heels, Letizia did not bow down to flat shoes for the occasion.
She wore a pair of black block heel sandals, which perfectly complimented the dress, and accessorised with dainty white floral earrings.