Pharrell Williams signs book deal to pen children's books

The Gust of Wind singer has inked a deal with Putnam Books for Young Readers which will see the 41-year-old musician pen four picture books, with the first title being based on his chart-topping 2013 single, Happy.

Announcing the deal, the publishing house revealed an initial run of 250 000 copies of Happy will be made available from 22 September and will feature numerous photographs of children around the world "celebrating what it means to be happy".