Justin and Hailey Bieber have baby fever! See couple pose with adorable newborn

Justin Bieber and his supermodel wife Hailey Bieber couldn't help but swoon over their pal Jason Kennedy's newborn son, Ryver Rhodes, who they lovingly referred to as their "nephew."

While ringing in the Fourth of July with the adorable infant, the 28-year-old pop star and model, 25, appeared to have a case of baby fever as they planted kisses on both the child's cheeks. 

In an image, posted to the Sorry singer's Instagram account on Monday, Justin can be seen sporting a backward olive green baseball cap and striped button-down over a plain white t-shirt. Check out the post below!

His spouse looked cozy in a fuzzy sweatshirt, hoop earrings and her light brown hair slicked back in a high ponytail. As she cradled the baby boy, who Kennedy shares with Lauren Scruggs, Hailey was a natural at keeping him calm and at ease.

In late April, Justin shared a photo snuggling with Ryver and wrote a sweet caption vowing to protect the baby "for life."