Pharrell Williams plans to turn hit song "Happy" into a children's book.
The 41-year-old singer will write a series of picture books based on the No. 1 single for Putnam of Penguin Books. The first of four works will be published Sept. 22, and include pictures of children around the world celebrating what makes them happy.
"I'm humbled by the global success of 'Happy,' but especially in awe of the song's young fans," Williams said in a statement. "My collaboration with Penguin allows me to continue a dialogue with these children in a new, fresh way. We're both committed to feeding the curiosity of young minds with imagination."
"Happy" is the lead single from Williams' second studio album, Girl (2014). The song reached No. 1 on several charts, and sold 6.45 million copies in the U.S. The track was featured in Despicable Me 2, and subsequently nominated for an Academy Award for Best Original Song.
Williams won three more Grammy awards, including Best Music Video and Best Pop Solo Performance for "Happy," last week. The singer will return as a coach on season eight of NBC reality competition The Voice on Feb. 23.