Musician Pharrell Williams attends The 57th Annual GRAMMY Awards at the STAPLES Center on February 8, 2015 in Los Angeles, California

Musician Pharrell Williams attends The 57th Annual GRAMMY Awards at the STAPLES Center on February 8, 2015 in Los Angeles, California

*Pharrell Williams its expending his “Happy” phenomenon into children’s literature.

The musician inked a deal with publisher Putnam to write four new books for young readers, beginning with one inspired by his smash song, Billboard reports.

A 250,000-copy run of Happy, the book, will be published on September, and feature photographs of children from around the world “celebrating what it means to be happy.”

Pharrell originally released “Happy” in 2013 as part of the “Despicable Me 2” soundtrack, later creating the world’s first 24-hour music video to accompany it and adopting it for his own solo LP, “Girl.”

The song topped the Hot 100 in March of 2014, where it remained for 10 straight weeks. “It became Pharrell’s fourth Hot 100 number one, but his first as a lead artist.

“Happy” also earned Pharrell an Oscar nomination in 2014 for Best Original Song (it lost to Frozen’s “Let It Go”), and this year it won two Grammys: Best Pop Solo Performance and Best Music Video.

Pharrell performed a dramatic new rendition of the song at the Grammys as well, where he was joined by classical pianist Lang Lang, film composer Hans Zimmer and a cadre of dancers wearing hoodies and raising their hands in the “hands up, don’t shoot” motion.

“Happy” also earned Pharrell a sit-down with Oprah last year, when he teared up while being shown a collection of fan videos of folks dancing to the track: “It’s overwhelming because it’s like, I love what I do and I just appreciate the fact that people have believed in me for so long that I could make it to this point to feel that.”