The "DAISIES" singer, 31, shared some adorable new photos of his 11-month-old son Jack Blues, whom he shares with wife Hailey Bieber, 28, on his Instagram on Thursday, Aug. 14. In one post, the father-son duo could be seen twinning in matching pink outfits.

The initials hold special meaning within Justin's family, as they are shared by his father, Jeremy, his half-sister, Jazmyn Bieber, 16 and his half-brother, Jaxon Bieber, 14.