King Charles looks cheerful as he hosts pre-Christmas lunch with Duchess Sophie and Lady Gabriella Kingston

The King arrived to host his Christmas lunch at the palace, alongside his private secretary, Sir Clive Alderton.

The Queen arrived separately to her husband, waving as her car whisked her through the gates of the palace. 

Camilla, 77, donned a berry-hued dress with a pearl necklace. 

The King's younger brother, Prince Edward and his wife Sophie, smiled as they arrived by car at the palace. 

The Duchess of Edinburgh looked elegant in a navy and white polka dot ensemble with a cream coat. 

Princess Beatrice and Edoardo Mapelli Mozzi were pictured arriving at the venue. Wrapping up against the winter chill, fashion-forward Beatrice, who is currently pregnant with her second child, kept her outfit under wraps while her husband took the wheel. 

The pregnant royal flashed a beaming smile from the passenger seat of the car. Looking radiant with a fresh face of makeup, Beatrice wore her hair down in loose waves.

Beatrice's sister Princess Eugenie followed closely behind in a car with husband Jack Brooksbank. The York royal wrapped up warm in a dark wool coat and adding a touch of sparkle thanks to a pair of glittering drop earrings. 

The pair's sighting comes after it was confirmed they would be skipping the annual family gathering at Sandringham this year in order to spend time with their respective in-laws.

Eugenie wore her brunette hair swept into a chic updo and enhanced her pretty features with rosy blush.

Princess Anne made a low profile entrance to her brother's pre-Christmas lunch, but she was pictured leaving alongside her husband Sir Timothy Laurence.

She paired a candy cane-inspired red and white striped scarf with her coat while Timothy went bold in an unconventional yellow patterned scarf.

Lord and Lady Frederick Windsor were pictured arriving with Lady Gabriella Kingston.

Lord Frederick and Lady Gabriella are the children of the Prince and Princess Michael of Kent.

Lady Gabriella was dressed in a high-necked coat and gold chunky earrings. 

She was last seen publicly at the Princess of Wales's Christmas carol service on 6 December.

The British writer sadly and unexpectedly lost her husband, Thomas Kingston, earlier this year. 

The financier died aged 45 from a "catastrophic head injury" and a gun was found near his body at his parents' home in the Cotswolds, on 25 February.

Sophie looked festive in a green velvet dress with pearl earrings.

The actress, who shares two daughters with Lord Frederick Windsor, is known for her roles in Peep Show and Sanditon.

The Duke of Kent was pictured arriving at King Charles' lunch. The late Queen Elizabeth II's cousin usually makes an appearance at the family's Sandringham festivities over Christmas, too.

Prince and Princess Michael of Kent were among the guests at the exclusive luncheon. 

Marie Christine looked chic in a grey wool coat layered over a red wool jumper, accessorising her festive attire with large, gold-rimmed pearl earrings.

Lady Marina (left) and Lady Amelia Windsor (right) were driven to the festivities in style. The fashionable siblings opted for understated outfits to celebrate the holidays with their family members. 

Penelope Knatchbull, Countess Mountbatten of Burma is a longtime friend of the royal family, and was particularly close to the late Queen and Prince Philip. 

She opted for a monochromatic ensemble including a black and white dress and an ivory scarf.

Channelling her rebellious grandmother Princess Margaret, Lady Margarita Armstrong-Jones couldn't help but catch the eye in a kaleidoscope of colour. 

Steering clear of the traditional Christmas reds, greens and blacks, she wore a pink, red, green and blue patterned jacket over a bold crimson top. Gold hoop earrings and radiant, glowy makeup completed her look.

Lady Sarah Chatto and her husband Daniel's son Samuel, 28, wrapped up warm as he arrived by car. His festive cherry red patterned tie and crisp white shirt could just be seen underneath his woolly grey and tan scarf.

The late Queen Elizabeth II's cousin Princess Alexandra made a glamorous appearance in oversized pearl earrings with her hair styled in a sleek half-updo.

Flora Ogilvy's parents James and Julia were all smiles for the family outing. While Princess Alexandra's son opted for a classic black jacket, his wife added a splash of festive cheer with her berry scarf, matching lipstick and sparkly drop earrings.

Flora Vesterberg (nee Ogilvy) and her husband Timothy wore coordinating royal blue outfits for the Christmas outing. The former was pictured in a luxurious coat with oversized gold buttons while Timothy rocked an icy blue tie.