The couple welcomed their first two children at St. Mary's, and Princess Diana gave birth to William and Harry there as well.
However, while they may have flat-pack furniture in their bedrooms, George and Charlotte are not exactly slumming it - they do after all live in Kensington Palace, once the home of Queen Victoria.
She said the duke had a strong shot and said she was impressed with the duchess.
So what are they doing in Sweden then?
William - second-in-line to the throne - served in Britain's armed forces from 2006 until 2013, and worked as a search and rescue helicopter pilot before he started a year ago to focus full-time on his royal duties.
The final event of the day was a black tie dinner at the residence of the British Ambassador.
The game originated in Cambridgeshire and dates back to 1813. Crown Princess Victoria and husband Prince Daniel are among the other royal guests expected to be present as well. Ahead of meeting William and Kate, Marcus had said: "It would be nice to know if they have any Ikea furniture".
"Kate had played field hockey and I was expecting her to be good, and she was very good ... she had a very good swing", Anna Widing told media.
William and Kate met more Swedish celebs during tonight's formal gala, including actors Alicia Vikander and Stellan Skarsgård.
While looking at numerous exhibitions, Kate got the chance to try out one designer's chair.
The revealing post on Tucker's private Instagram account has been making the rounds on royal style blogs this week, with the British hairdresser sharing a snap of her stash of beauty products in preparation for the four-day trip.
For their last night in Stockholm, they will head to the Fotografiska Gallery where they will be given a short tour by United Kingdom photographer Nick Veasey.
Royals.they're just like us: Their ears get cold in the winter and their forced to don an, albeit chic, pom-pom beanie.