But the Dutch royals put their personal tragedy to one side as they joined together to celebrate a family wedding.
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The sovereign watched proudly as her niece, Caroline of Bourbon-Parma, married fashion heir Albert Brenninkmeijer in Florence, Italy.
Caroline is the youngest daughter of the queen's sister, Irene.
Now an extended member of the House of Orange-Nassau, Albert is already well versed in society life.
His family founded international clothing chain C&A and are considered to be one of the richest in Europe.
Also sharing the couple's joy were Crown Prince Willem-Alexander and his wife Maxima, who was the epitome of elegance in a sheer beige top and feather detail skirt.
Johan Friso's activist wife Mabel was also present. Her bright smile showed that the constant support of her husband's family – particularly sister-in-law Maxima – is helping her through these difficult times.
Watch: Prince William takes George to meet his sister
It's a little princess!