In another photo, Nina and Philippos cut their layered wedding cake. Nina shared that the couple didn't have cake at their official ceremony last year.
"Our wedding cake!" she wrote in the caption. "We didn't actually have one at our civil ceremony, so this is very special."
Greece abolished the monarchy in 1974. However, the royal family - King Constantine, Queen Anne-Marie and their children - still use their titles. On top of that, they continue to enjoy a close relationship with Europe's royal families.
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Princess Diana is one of Philippos' many godparents. He is also the godson and first cousin twice removed of Prince Philip. His uncle, King Juan Carlos of Spain is another godfather, as is his aunt Princess Benedikte of Denmark and his first cousin, Infanta Elena of Spain.