The card includes a message which reads: "The Duke and Duchess of Cambridge and Prince George are so grateful to you for the kind message you sent at christmas and send you their best wishes for a very Happy New Year."
The cute card - the couple's first to include George - will no doubt be a treasured memento for royal fans.
The little Prince has not been seen in public since his 23 October Christening - that being only the third time he was photographed by press photographers since his birth.
He made his debut at one day old being carried out of the hospital in his mother's arms, and his second photo opportunity came a few hours later when he was taken out in a car seat by his father, who put him in the back of his Range Rover.
In addition, William and Kate have released two rounds of official photos - London-born photographer Jason Bell's pictures from the Christening and an earlier set taken by the Duchess' father Michael in the Middleton family home in Buckleberry.
Royal fans are eager to see seven-month-old George again, and are hoping the couple will be happy to show him off when they travel to New Zealand and Australia in March.