Prince George and Princess Charlotte will attend the Royal Family's Sandringham Christmas church service today for the first time.
The youngsters will walk the path to St Mary Magdalene Church, which will be lined with crowds of royal fans - some of whom have waited hours on Christmas Day morning.
Kate and William are expected to leave Prince Louis at home with Kate's parents as he is still too young to join them on the stroll.
George, six, was also seen earlier this week as he mixed a Christmas pudding alongside Prince William, Charles and the Queen.
Doting dad Prince William was seen helping his son mix the festive treat as grandfather Charles laughs merrily at George repeatedly stabbing at the thick pudding mixture with a wooden spoon.
Today's Sandringham service comes ahead of the Queen's Christmas Day message in which she will describe 2019 as "quite bumpy".
Prince Philip was released from hospital just yesterday - and it is not known if he will be attending the service.
The 98-year-old was admitted to the King Edward VII's Hospital in central London for treatment relating to a 'pre-existing condition' last Friday.
He suffered flu-like symptoms in recent weeks and had a bad fall that left him bed-stricken for a few days and his extended stay at the hospital is reportedly for 'precautionary measures'.
Prince Andrew, who is embroiled in the Jeffrey Epstein sex scandal, also usually joins the family at church.
However, it's not known if he will be there today.
Earlier this week, Prince Andrew and his ex-wife Sarah, Duchess of York, shared their festive card, which features one image of one of their Norfolk terriers nose-deep in a bush with it's rear end to the camera.
The card appeared to hint at Andrew wishing his nightmare year to end as a caption alongside it says: 'Say Goodbye to 2019.'
Another not-so-thinly veiled reference to the family's turbulent year is in a second photo which shows what is believed to be the Queen's Balmoral estate and a path through the Highlands.
A message alongside it reads: 'We Look to the Road Ahead.'
Written inside the embossed card is a message from the pair and their two daughters Beatrice, 31, and Eugenie, 29, which says: 'We are united with gratitude for your support and kindness, Thank you.'
