The Duke and Duchess of Cambridge followed royal tradition during their tour down under and gave a photograph of themselves as presents.
A family picture of William, Kate and Prince George was presented as an official gift during their visit to New Zealand and Australia earlier this year.
The image was signed by the Duke and Duchess and displayed in a frame which featured the couple's intertwined cyphers - their initials below a coronet.
The picture, showing Kate holding her son and the trio all smiling, has not been seen in public before and came to light after it appeared on social media sites.
The Queen presents photographs of herself and the Duke of Edinburgh as official gifts when on overseas tours as do the Prince of Wales and Duchess of Cornwall.
It is not known how many framed pictures were given but a Kensington Palace spokeswoman said they were presented to "people involved in the tour or people they met".
Celebrity portrait photographer Jason Bell took the picture and was also the official photographer for George's christening in October 2013.
Bell is renowned for his images of Hollywood stars and rock and pop legends like Sir Paul McCartney, actress Scarlett Johansson and former England footballer David Beckham.