Kate and Meghan are said to have been ordered by the Queen to put on a show of unity together at the Christmas Day church service in Sandringham.
Her Royal Highness and Prince Charles allegedly made it clear that any rift between the two duchesses must be kept out of the public eye as they arrived together at the St Mary Magdalene Church.
The two appeared to take the advice on board as they were seen laughing and joking while photographers captured the pair walking towards the church.
The Duchess of Cambridge and the Duchess of Sussex were seen laughing and joking arriving at St Mary Magdalene church
Kate, 36, and Meghan, 37, were greeted by adoring crowds as they made their way to St Mary Magdalene Church, a short walk from Sandringham House on the Royal Family’s Norfolk estate, alongside their husbands Prince William and Harry and Prince Charles
Meghan,Kate, Harry and William on Christmas day at Sandringham as Meghan places a hand on Kate’s back as they leave the church
Britain’s Queen Elizabeth II departs the Royal Family’s traditional Christmas Day service at St Mary Magdalene Church
A source told The Sun: ‘The Queen and Charles have allowed the situation to play out without overtly interfering — but they both made it clear that Christmas was for the whole family to really come together.
‘That meant the two couples walking into church together as the Fab Four just like they had last year. Yes, it was awkward and uncomfortable given what’s gone on over the past 12 months.
‘But the alternative of even more negativity on Christmas Day wasn’t worth thinking about.’
The Queen allegedly told Kate and pregnant Meghan to put their differences aside by the time they sat down to watch her speech along with the rest of the nation at 3pm on BBC.
It comes as there have been rumours swirling for months of a rift between Meghan and other royals.
Rumours of the feud surfaced when the Duke and Duchess of Sussex announced they were moving out of Kensington Palace to live in Frogmore House in Windsor.
There were also reports of a falling out between Meghan and Kate during Princess Charlotte’s bridesmaid dress fitting before the royal wedding earlier this year.
It was also claimed that Prince William told the Queen that he did not think Meghan was a suitable wife for his brother.
It was hinted earlier this month that the Cambridge’s would spend the day with the Middleton family in Berkshire, and Harry and Meghan would spend it with the Queen.
However Kensington Palace later confirmed they would be celebrating the day together in what was a show of solidarity between the royals.
The Royals’ were led by Prince Charles to the church at the Norfolk estate, following by his sons and their wives and the rest of the family.
Daniel Chapman and mother Susan Chapman, 52, gave Kate a bouquet.
Mr Chapman, 25, said: ‘Kate came over and took a bouquet and wished me and my mum a merry Christmas.
‘We all said afterwards that there didn’t seem to be the animosity that was rumoured.
‘They were all laughing and joking. There was no sign of anything untoward at all. Everyone was easy going and laid-back.’
Kate and Meghan chatted to one another as they walked to the church this morning, alongside husbands Prince Harry and Prince William
Meghan covered up her baby bump as she held a handbag and her black gloves in her right hand as they walked to church this morning
Hundreds of well-wishers turned out to see the royal family, but the Duke of Edinburgh and the Duchess of Cornwall were missing.
Philip and Camilla did not join the rest of the royals as they made the short walk. It is understood the duke is in good health and will spend the day relaxing privately with his family.
Camilla missed an appearance at the Olympia Horse Show last week due to a heavy cold and is believed to be still recovering from the bug.
Kate and Meghan reportedly fell out over the last year with Kate being reported as crying at Princess Charlotte’s dress fitting for Meghan’s wedding
Prince Charles allegedly also told Meghan and Kate to ensure their feud was kept out of the public eye
Behind the lead group strode Peter Phillips holding the hands of his daughters Savannah and Isla, and they were followed by Princess Beatrice and Peter’s wife Autumn Phillips.
After the morning service at the Church of St Mary Magdalene on the royal estate is a traditional event where they greet well-wishers.
Back at the house, lunch is prepared by their staff and served at 1pm, and the royals indulge in a giant turkey, reared at Sandringham.
The Queen sometimes quietly leaves the room and lets her family watch the national address by themselves, as she views it alone to see how it comes across.
Boxing Day, when the royals enjoy a breakfast buffet of kedgeree, bacon and eggs, often involves outdoor pursuits such as shooting, riding and walking.
Kensington Palace did not comment on the Christmas Day truce.