When Hailey Bieber And JustinWhen the little boy came, he was delivered by the same doctor who also treated children for Khloe Kardashian And Kylie Jenner.

Justin and Hailey’s son, Jack Blues Bieberwas held by Dr. Thais Aliabadi … after birth certificateobtained by TMZ.

The document states that Dr. Aliabadi delivered Jack on familiar ground…the famous Cedars-Sinai Medical Center in Los Angeles…the same place where Kylie’s daughter Stormi Webster, was born.

Hailey and Justin’s doctor also brought Khloe and Tristan Thompson‘s children, TRUE And Tatum Thompson … and she has the the same goes for other celebrity moms How Halsey And Emma Roberts.

The birth certificate shows that Jack was born on August 22nd at 4:32 p.m.… one day before his famous parents announced his birth.

As we reported … Justin and Hailey previously announced the arrival of their little bundle of joy with an Instagram post on August 23, sharing a photo of the little guy’s foot.

Justin’s post simply said, “WELCOME HOME” and explained that the baby’s name is Jack Blues Bieber… which is also what it says on the birth certificate.

The new parents didn’t reveal exactly when or where Jack was born… and now we have the answer to both questions, as well as the interesting connection to the doctor.