They grow up so fast! Usher marked his son Usher Raymond V's latest milestone via an adorable collage of Instagram pictures March 19. "Look who lost his first tooth," the singer wrote in the caption.

PHOTOS: Usher's life as a dad

In the adorable snapshots, the 5-year-old cutie (whose mom is Usher's ex-wife, Tameka Foster) smiles wide and proudly shows off his missing incisor. One image features the father-son duo flashing their pearly whites together.

PHOTOS: Before they were on The Voice!

When he's not doting on sons Usher V and Naviyd, 4, the "Dive" singer is focused on The Voice. "Of course, winning The Voice is ultimately the goal of the show," the 34-year-old said on Today March 25. "But really, preparing incredible entertainers is really what I'm all about."

PHOTOS: Cee Lo Green's wacky Voice wardrobe

Usher -- who joined the show with Shakira after Cee Lo Green and Christina Aguilera left the talent competition -- has already earned high marks with veteran mentor Blake Shelton.  "I'm more attracted to Usher than I am to Adam Levine, as long as we're all being honest," the country star jokingly told Extra March 21. "He's sexy!"

The Voice airs Mondays and Tuesdays at 8 p.m. EST on NBC.

This article originally appeared on Usher's Son, Usher Raymond V, Loses His First Tooth: Pictures