Queen Letizia joined her husband during an event in Seville where they awarded the first Andalucian Medal of Honour. The mother-of-two opted for one of her favourites: an elegant ice blue midi dress. Where the beautiful gown is from remains a mystery.

She paired the dress with a matching blue Mascaró clutch and beige Prada heels.

As for jewellery, Letizia wore a pair of silver hoop earrings and a gold ring by Karen Hallam.

The monarch kept her makeup to a minimum, only wearing soft brown smokey eyes and her hair loose around her shoulders.

She was seen wearing a plain white face mask in line with Spanish Covid regulations.

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Queen Letizia wore the dress in 2019, during a welcoming ceremony at Zarzuela Palace.

She also donned the gown in June 2018 during a state visit to the US to meet Donald and Melania Trump.

But the dress was also her choice to celebrate her husband’s coronation anniversary five years ago.

The outfit is her best-kept secret as after wearing it on several occasions, fans still don’t know where the dress is from.

“Kate and Queen Letizia are my current fashion icons,” another one commented.

“Queen Letizia looked beautiful in all blue today,” said a third one.

King Felipe and Queen Letizia will meet with South Korea’s President Moon Jae-in and wife Kim Jung tomorrow.

On Friday, they will be celebrating the seventh coronation anniversary with their daughters, Princess Leonor and Princess Sofia.