Prince William drove the couple in for the Queen’s annual festive feast where royals and distinguished guests arrived en masse to welcome in the season.
Kate wore a cherry red coat to the traditional family affair, but appeared to have left the youngest royal at home with an apparently empty baby seat sitting in the back of the Range Rover, the Daily Mail reports.
Crowds lined the Mall outside the palace to welcome royals as they arrived en masse.
Her Majesty welcomed Prince Charles, Camilla, Prince Edward, Princess Anne, Princess Beatrice, the Duchess of Kent and other members of the royal family.
Prince Harry was absent from the annual celebration, having just completed his charity trek to the South Pole.
The 29-year-old royal is expected to join the Queen and other family members at Sandringham for Christmas.
William, Kate, and baby George will reportedly spend Christmas Eve and Christmas Day in Sandringham for the five-month old Prince’s first Christmas.