This year marks 10 years since the Duke and Duchess of Cambridge were married at Westminster Abbey as the world watched.
But we've been mesmerised by their love story for even longer than that.
The pair first met at the University of St Andrews after enrolling to study there in 2001 and they became good friends.
Their relationship later blossomed into something more and became public in 2004.
However, a royal expert claims the couple actually crossed paths years before any of this happened when Kate was just nine-years-old.
According to author Katie Nicholl, who has written various books about the Royal Family, William may have first caught Kate's eye when their schools' hockey teams played each other.
The young prince, then nine, and his classmates reportedly went to Kate's school - St. Andrew's Prep - for a fixture.
Although it's unclear as to whether the two actually spoke, there was understandably a lot of excitement at school that day.
In her book Kate: The Future Queen, Nicholl writes: "Although she wasn't especially interested in boys, the arrival of one particular young man had caught her attention.
"Nearby Ludgrove Prep school would often play matches against St. Andrew's Prep, and there was much excitement when Prince William, a left back on Ludgrove's Colts team, came to St. Andrew's to play a hockey match when he was nine years old.
"William, like Kate, loved sports and was one of the best hockey and rugby players in his year. Of course, the arrival of the prince generated a flurry of excitement."
Kate, now 39, is said to have loved her time at St Andrew's Prep, and even returned there as part of her royal role in 2012 to open the school's new hockey pitch.
Speaking at the time, she said: "It is such a treat to be back here at St Andrew's. I absolutely loved my time here; they were some of my happiest years, which makes it so incredibly special to be here today.
"In fact, I enjoyed it so much that when I had to leave, I told my mother that I was going to come back to be a teacher. While that didn't quite happen, I was thrilled to have been asked back today on St. Andrew's Day.
"It was while I was here at school that I realised my love of sport. Sport has been a huge part of my life, and I feel incredibly grateful for the opportunities I had to get outside and play in such wonderful open spaces - though sadly there was nothing quite as glamorous as this in my time!
"I hope that you all enjoy playing sport here as much as I used to, and make the most of these incredible facilities."
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