Everything you need to know about Prince Frederik and Princess Mary of Denmark

Prince Frederik's wife will be the first Australian-born queen of a European monarchy

Danish Crown Prince Frederik and Danish Crown Princess Mary arrive at Christiansborg Palace, Copenhagen. Picture: Ida Marie Odgaard/Ritzau Scanpix via AP

On New Year’s Eve, Denmark’s Queen Margrethe II, Europe's longest-serving monarch, announced that she would abdicate on January 14 after 52 years on the throne.

The 83-year-old queen revealed the news on live TV during her traditional New Year's Eve speech.