McFly stars Tom Fletcher and Dougie Poynter are writing a children's book.
The 'All About You' pop stars have signed a deal to write two books, the first of which will be called 'The Dinosaur That Pooped Christmas'.
Tom told BBC Newsbeat: ''I think it's easy to see that this book comes from Dougie's fascination with dinosaurs, my love for Christmas and a shared obsession with poop.''
Describing the plot line, he added it is ''about a boy who gets a dinosaur for Christmas which goes on an unstoppable festive eating rampage until Christmas is gone.
''The only way to get Christmas back is for the dinosaur to poop it out.''
Despite the comedy title, the guitarist and bassist have put a lot of effort into writing the tome, and ''spent hours'' in book shops to ''get inspiration when writing''.
Tom added: ''We want people to know that this book comes from a genuine passion for writing and reading and it's hopefully the first of many.
''We wrote what we found funny, a book we would have loved as kids. And we hope parents will enjoy it just as much as their children.''
The book will be illustrated by Garry Parsons, who has worked on other children's books, including 'There's an Ouch in my Pouch'.
McFly - which also includes Harry Judd and Danny Jones - are currently on tour across the UK.