The two new images feature The Prince of Wales with The Duchess of Cornwall, The Duke and Duchess of Cambridge, Prince George, Princess Charlotte, Prince Louis and The Duke and Duchess of Sussex.
The pictures were taken by Chris Jackson in the garden at Clarence House in September 2018.
Prince George can be seen beaming on his grandfather's lap, while Camilla gestures for Princess Charlotte to look at the camera.
The Duchess of Cambridge smiles as she holds Prince Louis in her arms next to a proud Prince William.
The Duke and Duchess of Cambridge laugh beside one another.
Chris Jackson said: “I was delighted to have been asked to take these portraits of The Prince of Wales surrounded by his family to celebrate the important milestone of his 70th Birthday. It was particularly special to capture such an informal and relaxed family portrait over a fun afternoon in the gardens of Clarence House.”
On the same day, Prince Louis, Prince Charles and Kate took separate photographs which were released earlier this month.
The doting grandad gazes adoringly at the Duchess of Cambridge and Prince William’s youngest child, as they stand in the garden of Clarence House.
The snap, taken in September, shows Baby Cambridge being held in his mother's arms, giggling and clutching his grandfather with his little hands.