Alongside the intimate picture, a caption reads: “Today it is 20 years since the Crown Prince and Crown Princess got married in Oslo Cathedral.
“Congratulations on the day, Crown Prince Haakon and Crown Princess Mette-Marit.”
Hundreds of well-wishers commented on the post to pass on their congratulations.”
One wrote: “Congratulations to the world’s most beautiful crown prince couple.”
Another commented: “Wow you look so beautiful and charming” whilst a third posted: “Congratulations to good role models.”
Many others commented with heart emojis and wishing the couple happiness.
The Princess is one of the more colourful members of royalty.
Born a commoner and hailing from a disadvantaged family, her parents divorced when she was young and her father married a stripper.
She had no illustrious family connections or a stable career to boast of and was the single mother to a son fathered by a convicted criminal when she began dating the Prince.
The couple have two children together, Princess Ingrid Alexandra, 17, and Prince Sverre Magnus, 15.
They reside on an estate in Asker, which lies just West of the country’s capital Oslo.
Since marrying the Prince, Princess Mette-Marit set up The Crown Prince and Crown Princess’s Foundation with her husband which helps young people gain leadership skills.
Source: EXPRESS CO UK