Of course, they have plenty more years of touring ahead.
But on their second official visit together - the first was to meet President Nicolas Sarkozy and Carla Bruni-Sarkozy in France - Crown Princess Victoria of Sweden and new husband Daniel looked thrilled to take in the sights in each other's company.
HELLO! goes to the polo with William and Harry
A kiss for her Princes: Kate, William and Harry join stars at polo
Prince Harry honours Wounded Warriors at the British Embassy in Washington
David and Samantha Cameron take part in the Sports Relief mile
Behind the scenes with Charlotte Casiraghi for Gucci’s new campaign
Zara Philips: 'I am really looking forward to the Olympics, it's going to be great'
Prince William takes flight on Falkland Islands duty
Barack Obama charms the crowds as he sings Al Green's hit 'Let's Stay Together'
William and Kate attend the premiere of 'War Horse'
The Duke and Duchess of Cambridge on their visit to UNICEF's emergency supply centre in Copenhagen
Montblanc unveil a unique tribute to the iconic Princess Grace in the presence of Princess Charlene and Prince Albert
Princess Charlene and Prince Albert view the "Montblanc Collection Princesse Grace de Monaco"
Harry honours his mother's legacy at the WellChild Awards
The Duke and Duchess of Cambridge travel to Birmingham to comfort those affected by the riots
Captain Mark Phillips talks about how he feels when daughter Zara competes
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