Singer John Legend is a new dad and while his daughter Luna’s infectious smile is what we’d like to think has inspired him to write a new song, it’s her stinky poop that has the songwriter belting out tunes about her stool.

In a tender Pampers commercial, the 39-year-old musician sings to Luna, the daughter he shares with model Chrissy Teigen, as he changes her “stinky” diaper, reports Daily Mail.

Legend looks rather comfortable on daddy diaper duty and he’s recently had another baby which means he and Teigen will be changing quite a few Pampers for some time.

READ ONLY: 3 Things we just learned from Nicki Minaj’s super candid Elle Magazine interview

Teigan assumed the role as Creative Consultant for the Pampers Pure Collection diapers back in March. As part of the role, she’s enlisted her husband for the cute commercial along with a few other diaper-changing dads.

Luna’s been all over Teigan’s Instagram modeling her Pampers too. The little cutie is now walking, but it looks like she’s not quite ready to put that poopy in the potty just yet.

Fortunately for all involved, daddy’s got it covered.

“John’s been singing this song to Luna since her very first diaper change in the hospital and he hasn’t missed one opportunity since,” Chrissy explained on Twitter and Instagram, introducing the clip.

“I present to you, the underground hit of our household – the stinky booty song! #StinkyBootyDuty #ProudCreativeConsultant,” a proud Teigan boasted.

In the commercial, Legend kneels in front of Luna and starts singing.

“You ready Luna?” he asks. “Somebody’s got a stinky booty! Her name is Luna and she made a poopy,” he starts singing.

John legend Luna Legend thegrio.com
Sweet moment between father and daughter in new Pampers commercial. (Instagram)

The catchy tune even made Luna smile. Other dads in the commercial sings the stinky booty tune too. “Somebody’s got a stinky booty! And daddy’s gonna clean it up!”

READ ONLY: Kim Kardashian dishes on Alice Johnson’s release on the Today Show

Legend shared the video with the caption: “Luna is my best audience and biggest fan, so obviously I had to write a song for when I’m on diaper duty. Sing it with me now…”

The video is definitely an ode to all the diaper changing dads everywhere. This Sunday is Father’s Day and the video ends with the message: “Thank you, Dad, for making every moment special.”

How Legend can sing and not hold his breath while changing Luna’s stinky poo at the same time still remains a mystery.

Check out the cuteness below: