On 20th November 2017 the Queen and Prince Philip celebrate an impressive 70 years together, after getting married back in 1947.
The royal couple married six months after becoming engaged in 1946, shortly after the Queen's 21st birthday.
And now, the palace have released four new portraits of Queen Elizabeth II and Prince Philip to mark the special occasion.
The photos were taken in the White Drawing Room at Windsor Palace, and show the long-term couple smiling happily at one another.
To celebrate the 70th Wedding Anniversary of The Queen and The Duke of Edinburgh, new photographs are being released worldwide.Â (1/3) pic.twitter.com/zQBFjQTx3L— The Royal Family (@RoyalFamily) November 19, 2017
The portraits of Her Majesty and The Duke were taken by British photographer Matt Holyoak of Camera Press, in theÂ White Drawing Room at Windsor Castle earlier this month.Â (2/3) pic.twitter.com/YFUyp8azJJ— The Royal Family (@RoyalFamily) November 19, 2017
In these new photographs, The Queen and The Duke were pictured in front of a platinum-textured back drop.— The Royal Family (@RoyalFamily) November 19, 2017
The marriage of the then Princess Elizabeth to Lieutenant Philip Mountbatten took place at Westminster Abbey on 20th November 1947. (3/3) pic.twitter.com/Orf37QKqwC
The couple, who have been widely praised for their long and enduring marriage, are thought to be spending the day privately at home.
Back in 1997, on the couple's golden wedding anniversary, Prince Philip also shared his thoughts about the secret behind his and the Queen's successful marriage.
He confessed that much of their partnership is based on tolerance - perhaps understandable given the Prince's widely known cheeky side.
Prince Philip said, "I think the main lesson that we have learnt is that tolerance is the one essential ingredient of any happy marriage.
"It may not be quite so important when things are going well, but it is absolutely vital when the going gets difficult.
"You can take it from me that the Queen has the quality of tolerance in abundance."
Royal biographers and commentators have also commented on the fact that much of their relationship relies on the fact that they can still make each other laugh - they say, a key component of getting through the hectic and demanding life of a royal.
Former BBC royal correspondent Jennie Bond told The Telegraph, "You have to list companionship, friendship and shared experience as having seen them through to this remarkable anniversary, as well as a very deep love between them.
"But a big part of what has kept them going over so many years is the fact they can share a joke together."
Whilst usually reserved and professional when on royal engagements, when the Queen and Philip are pictured out together, they're often seen sharing a laugh together - usually prompted by the Prince's naughty sense of humour.