Middleton family features in royal baby books

This is a handout image released by Kensington Palace on Thursday July 9, 2015, of Britain's Prince William, seated left, Kate Duchess of Cambridge with their children, Prince George, seated 2nd left,

They have dined with the Queen at Windsor Castle and joined the royal family at Ascot.

Now the Middletons have had their almost-royal credentials boosted even further - by being immortalised in a series of royal baby books.

The cover of the latest book on the royal baby series. Photo / Amazon

Carole, Michael and Pippa Middleton - but not her brother James - all have star turns in the Shhh! Don't Wake the Royal Baby! series, on sale in the Buckingham Palace gift shop for £6.99 each (about NZ$14).

The Duchess of Cambridge's family join the royals to organise Prince George's first birthday party in Happy Birthday, Royal Baby!

Wielding a to-do list, Pippa is seen announcing: "Everything needs to be perfect for the Royal Baby's celebrations".

Later, the young prince's auntie dons a pair of roller skates to organise "pin the tail on the corgi", "musical thrones" and "pass the peacock".

Middleton matriarch Carole - wearing the same floral-print dress she wore to visit George for the first time in hospital - is shown in a headset ordering the "royal balloon blower" to use "More puff! More puff!'"

Grandfather Michael, meanwhile, can be seen trying out George's bouncy castle in the palace garden.

The Queen, Prince Harry, Prince Charles and the Duchess of Cornwall - as well as William and Kate - also make several appearances in the trio of books.

The books, written by Martha Mumford and illustrated by Ada Grey, are described by publishers Bloomsbury as "bright, bold and fabulously funny". All proceeds go towards the upkeep of the Royal Collection.

- Daily Mail