In the presence of their eldest daughter, Princess Katarina Amalia, and others, the King and Queen hung a love lock on a special metal structure designed for lovers to attach their locks to in honor of their relationship.

Queen Maxima with her husband and daughter / Photo: Getty Images

On this special day for the royal couple, Maxima looked especially bright.

She wore a loose-fitting yellow Natan Couture dress, snakeskin pumps and a matching clutch.

The shoes and bag were also from the Queen's favorite brand, Natan Couture.

Maxima wore a laconic hat from La Maison Fabienne Delvigne, a pearl necklace around her neck, and pearl earrings from Steltman Jeweler in her ears.

Maxima also wore a watch, did a light manicure and light daytime makeup.

Queen Maxima / Photo: Getty Images

King Willem-Alexander was wearing a white shirt and blue trousers, and he had obviously taken off his jacket.

The couple were photographed attaching their castle to the structure.

And next to them stood their daughter Katarina-Amalia.

The girl was wearing a floral blouse, red pants with arrows, nude heels and a blue clutch in her hands.

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