The crowds gathered from 5am this morning in a bid to see Prince George.
However, sources close to the Royal Family had hinted it was highly unlikely he would make an appearance for the Royal Familiy's Christmas mass close to their Sandringham Estate.
It is Prince George's first Christmas - but he remained at home in Sandringham while his doting parents travelled to mass and met up with his great-grandmother, the Queen.
Kate gave the queen a warm embrace - last year, she remained in her parents' home in Bucklebury as she was bed bound with severe morning sickness thanks to her pregnancy.
Kate, William and the queen were joined by Prince Philip, Prince Charles, Camilla, Princess Anne, Prince Andrew and Princesses Eugenie and Beatrice.
It is understood that Zara Philips - reportedly the queen's favourite grand-daugther - was also in attendance.
Heavily pregnant Zara - who is expecting her first child with her husband, the former England rugby player Mike Tindall - remained in a car as the family met up.
Kate was wearing a knee length cream coat.
She changed this to a tartan overcoat as she made her way into the mass.
Later, members of the family greeted members of the public who had waited outside to catch a glimpse of them.
It is believed that Prince George's next public outing will be early next year when he is expected to travel with his parents to New Zealand.