Though Prince William and Kate Middleton are now as strong as ever, the holiday time can bring up some sour memories for the two.
In Katie Nicholl's book The Making of a Royal Romance, the expert revealed that the parents-of-three hit a rough patch in December 2006.
At the time, the pair were only dating, and though they planned to spend Christmas with their own families, the Duke of Cambridge was set to join Kate and her brood for New Year's — but right after Christmas, on Boxing Day, he reportedly called Kate and canceled.
Though it may not seem like a big deal, the situation left Kate crying and concerned, as the royal family had advised William to slow down.
"William had been having second thoughts and sat down with his father and his grandmother to have a frank discussion about his future with Kate," Nicholl told The Mirror. "Both advised him not to hurry into anything."
The cancelation was a sign of things to come, as the then split in early 2007, though they eventually got back together.
At the moment, it remains unclear as to how the pair and their three kids — Prince George, 8, Princess Charlotte, 6, and Prince Louis, 3 — will celebrate Christmas this year, since Queen Elizabeth has been told to slow down her workload amid health concerns.
However, The Mirror reported that she is "still totally committed to hosting everyone as she hopes to make it back to full health in the coming weeks."
"This year, more than ever, it is incredibly important to Her Majesty to be surrounded by her loved ones. Her Majesty is resting under doctors’ orders with the intention of being able to fully enjoy the company of her extended family over the holiday period," a palace insider shared. "After being forced to cancel a host of engagements, the family get-together will be the perfect tonic."