Sarah Aubrey, head of original content for HBO Max, said: "We're so excited to bring the world Gary's created on Instagram over to HBO Max, where our viewers can discover what his Instagram fans already know - that George can be hilarious, shocking, and surprisingly sweet.
"We can't wait to see what Gary does with a bigger canvas to paint on than just a 1:1 square."
Gary added: "I'm thrilled to be working at HBO Max and bringing them yet another series about a family ruthlessly fighting for the throne."
Joining Orlando and Gary as part of the voice cast will be Iwan Rheon as Prince William, Lucy Punch as his wife Duchess Catherine and Condola Rashad as the Duchess of Sussex.
Tom Hollander will voice both Prince Charles and Prince Philip, while Frances De La Tour will be Queen Elizabeth and Alan Cumming is on board as George's butler, Owen.
20th Century Fox Television will produce the show.
-Bang! Showbiz