Four official images to mark the christening of Princess Charlotte have been released by Kensington Palace.

The formal images by photographer Mario Testino, feature the proud parents the Duke and Duchess of Cambridge, along with their respective families and of course Princess Charlotte's big brother Prince George.

The two-year-old was on his best behaviour as he struck the perfect pose for the family portrait marking the occasion.

George sits between his parents and his father tenderly places his arm around him, as the family sit in the drawing room of the Queen's private Norfolk residence.

Princess Charlotte\'s christening
Kate is caught in a tender moment at the daughter\'s christening Mario Testino /Art Partner

Wearing a pink coat, matching hat and floral dress, the Queen is seated beside William and Kate while Michael Middleton, Pippa Middleton, James Middleton, Carole Middleton, Prince Charles, the Duchess of Cornwall and the Duke of Edinburgh smile in the second row.

A Kensington Palace spokesman said: "The Duke and Duchess of Cambridge and their whole family had a wonderful day on Sunday and were delighted to share the special occasion with the thousands of people who came to Sandringham.

"They are very happy to share these photographs and hope that everyone enjoys them as much as they do."

Prince George
Photographer Mario Testino captured father and son in an intimate moment Mario Testino /Art Partner

The pictures were taken immediately after the fourth in line to the throne was christened at a church on the Sandringham estate on Sunday.

Separate black and white shots also capture candid moments between the princess with her mother, and George with his father.

It's the first time the Queen had been pictured by Testino, the world renowened celebrity photographer who also famously captured the late Diana, Princess of Wales.

Princess Charlotte\'s christening
The Duke and Duchess posed for an informal family photograph with their children Mario Testino /Art Partner

Testino has previously taken pictures of Princes William and Harry with their father, the Prince of Wales, and he took the Cambridges' engagement pictures.

Thousands of well wishers turned out to greet the royals ahead of the private christening at the Church of St Mary Magdalene on Sunday in the presence of 21 official guests.

Princess Charlotte's uncle, Prince Harry, has been noticeably absent from the family gathering and the portraits. The Prince is currently in Africa where he is working as a wildlife ranger for the next three months after retiring from military service.