Family of the star, including his parents and half-sister Jazmyn, have posted online to celebrate the arrival of his first child, son Jack Blues

Jeremy Bieber, Justin and Hailey Bieber. Photo: Jeremy Bieber/Instagram; Justin Bieber/Instagram

Justin Bieber’s dad Jeremy Bieber is a grandfather!

On Saturday, Aug 24, the singer’s dad Jeremy, 49, shared what appeared to be his reaction to Justin and his wife Hailey Baldwin Bieber welcoming their son Jack and announcing his arrival the day before.

In a brief post on X (formerly Twitter), Jeremy simply wrote, “Papa,” — seemingly a cute nod at his son’s new role.

The day before, Justin, 30, confirmed the news of his son Jack’s arrival in an Instagram post. He also shared the family tradition of naming his son with the same initials ‘JB’ as himself, his father and some of his siblings,

Posting a close-up shot of his baby boy’s feet, he wrote, “WELCOME HOME. JACK BLUES BIEBER 🐻.” Hailey, 27, reshared the post on her Instagram Stories, adding a bear and a blue heart emoji. This is the couple’s first child.

Justin and Hailey announced the arrival of their son Jack on Aug. 23. Justin Bieber/ Instagram

Justin’s half-sister Jazmyn Bieber, 16, also posted her reaction to becoming an aunt for the first time on Aug. 24. She reshared the singer’s initial post announcing Jack’s birth on her Instagram Stories, adding a teary-eyed face and white heart emoji.

The day before, Justin’s mom mother and author Pattie Mallette had shared her excited reaction, too, calling the newborn’s arrival a “miracle” on her Instagram Stories.

“OH MY HEART,” Mallette, 49, wrote over Justin’s image of the baby’s foot. “WELCOME BABY JACK!! I LOVE YOU SO MUCH!😭😭😭🫠🫠🫠🥹🥹🥹.”

“THANK THE LORD[,] WHAT A MIRACLE! 🎉💃🙌 ,” she added.

Justin is Malette’s only son and Jack’s birth marks the first time both herself and Jeremy have become grandparents. The former couple split when before Justin was born in 1994.

Malette added, in another excited post on X about the birth of Jack, “😭😭😭😭😭😭 🥹🥹🥹🫠🫠🫠 🙌🙌🙌🙌🙌🙌 CONGRATULATIONS @justinbieber & Hailey,” tagging her daughter-in-law. “I LOVE YOU FOREVER BABY JACK!!”

Hailey’s dad, Stephen Baldwin, reshared Mallette’s tweet, adding, “Amen, Congratulations to you and may God continue to bless our family.”

Justin and Hailey first announced they were expecting a child together back in May. At the time, a rep for Hailley confirmed to PEOPLE that the model was just over six months pregnant.

The couple have been married for almost six years now, having first tied the knot in a New York City courthouse in September 2018. They later celebrated with a larger ceremony with family and friends, in Bluffton, South Carolina in 2019.