The Curious Tale of Fi-Rex will include a host of celebrity characters and money from sales will go towards U.K. charity Children In Need.

The British boy band was depicted as a group of frogs called Pond Direction, however illustrators have edited the book after Malik left the group in March (15) in a bid to live "a normal life".

A source tells Britain's Daily Mirror newspaper, "Although there are lots of celebs helping with the book, One Direction are by far the most appealing... to young readers so the publishers had to ensure their most popular pages would be up-to-date."

Other stars slated to appear in the charity book include singer Kylie Minogue, TV presenter Amanda Holden and pop star Ronan Keating.