Pharrell Williams set to write kids' book based on 'Happy' song

Pharrell Williams is ready to write a children's book based on his hit track 'Happy.'

The 41-year-old has signed a deal for a picture book that would showcase photographs of children across cultures "celebrating happiness," the CNN reported.

After Williams signed the book deal for "Happy!" with Putnam Books for Young Readers, three more books were negotiated with the soon-to-be children's author.

The book deal comes after Williams recent Grammy wins including best pop solo performance and best music video for his hit song, "Happy." The book is due to publish in September.