The Queen welcomed King Willem-Alexander and his wife Queen Maxima at her royal residence, Windsor Castle.
It was the first time the trio met since the Dutch couple ascended to the throne in April.
No doubt Prince William and pregnant Kate Middleton, who is due to give birth to the royal baby any day now, are on the Queen's mind. The reigning monarch met with her grandson earlier this week at Sandringham Castle, perhaps to discuss the royal baby's official title or possible name.
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The Queen was all smiles however as she continued her royal duties and welcomed her guests to Windsor Castle. She looked like she was enjoying the summery weather and chose a long-sleeved cream dress with blue and green flower prints for the occasion.
Maxima, who has gained a reputation as a fashion-forward royal, showed she was just as stylish as on her inauguration day. The Argentine-born beauty showed off her penchant for bold colours, donning a bright red sleeveless dress.
Maxima completed her look with patent nude heels, similar to those favoured by Kate Middleton and her younger sister Pippa Middleton, and accessorised with gold dangly earrings, a thick bracelet and a matching gold brooch.
Her husband King Willem-Alexander looked just as impeccable in a black suit with a crisp, blue tie. The trio happily posed for photographs before attending to their royal affairs.
Willem-Alexander and Maxima, Europe's youngest ruling royals, were crowned King and Queen on 30 April after the then Queen Beatrix abdicated in favour of her son after 33 years on the Dutch throne.
The inauguration was attended by royals from around the world, including British representatives Prince Charles and the Duchess of Cornwall and their counterparts from Denmark, Norway, Belgium, Spain, Morocco and Thailand.
Outside the palace, meanwhile, in the famous Dam Square, tens of thousands of well-wishers gathered in the festively decked-out capital to welcome the country's first king in 120 years.