Justin Bieber is a big brother once again following the birth Thursday of baby girl Bay Bieber from Justin's father, Jeremy Bieber, and step-mother, Chelsey Bieber.
"Meet the newest bieber, my little sister BAY BIEBER," Bieber said.
Jeremy also shared the news about Bay's arrival on Instagram, posting a photo of himself, the baby and Chelsey inside the delivery room.
"We welcomed a healthy baby "Bay Bieber" born at 830 am," Jeremy said.
Jeremy and Chelsey tied the knot in February during a wedding that was attended by Bieber and his ex, Selena Gomez.
In Julu, Bieber confirmed he was engaged to Hailey Baldwin.