Paul McCartney publishing children's picture book

Paul McCartney plays a secret gig at Abbey Road studios. Amongst the guests were Kylie Minogue and Johnny DeppFeaturing: Sir Paul McCartneyWhere: Kings London, United KingdomWhen: 23 Jul 2018Credit: John Rainford/WENN

Paul McCartney has written another children's picture book, titled 'Hey Grandude!'

The Beatles rocker has written a story about Grandude, an intrepid explorer grandfather, who whisks his four grandchildren off on extraordinary, magical adventures, and is inspired by his own experiences of being a grandfather.

Explaining the title, which is presumably a nod to the Fab Four's famous song Hey Jude, McCartney said in a video announcement on Thursday, "I've got eight grandchildren and they're all beautiful and one day one of them said to me 'Hey Grandude!' I said 'What?' and I thought, 'I kind of like that', so from then on I was kind of known as Grandude.

"So I thought, you know what, it's actually a nice idea for a book, so I started to write some stories, and then I talked to the book publishers and they liked what I was doing."

He showed off some of the illustrations drawn by Canadian artist Kathryn Durst, and explained his inspiration behind the project.

"I wanted to write it just for grandparents everywhere – and their kids – so it gives you something to read to the grandkids at bed time," he said. "We hope you'll join on these magic adventures."

McCartney previously released a picture book, titled High in the Clouds, with author Philip Ardagh and illustrator Geoff Dunbar in 2005.

Hey Grandude! will be published by Puffin Books in the U.K. and the children's division of Random House in the U.S., in September 2019.

McCartney has four grandchildren via his fashion designer daughter Stella, and four through photographer daughter Mary.