Kensington Royal (the account for official palace photos) posted a picture of Prince Harry on Instagram that wasn't precisely a card, but will do as a stand-in for one.
The caption reads: "Merry Christmas from Prince Harry. He has chosen this photograph with Battle of Britain veteran Tom Neil for his Christmas card. Prince Harry considered it a great honour to meet Tom during the Battle of Britain flypast in September. It was one of his most memorable moments of 2015."
Meanwhile, Clarence House (the official account representing Prince Charles and Duchess Camilla) posted this more traditional image of a card nestled in a Christmas tree, showing Charles and Camilla hugging.
The caption reads: "Here's a sneak peek of The Prince of Wales and The Duchess of Cornwall's official Christmas card. The photo was taken during TRH's summer holiday in Scotland by a friend."
(TRH in this case refers to "Their Royal Highnesses.")Chris Jelf / @KensingtonRoyal