According to PEOPLE, Justin and Hailey Bieber had been praying for Hailey’s pregnancy for a while and are overjoyed by the arrival of their “miracle” baby, Jack Blues Bieber.

“The pregnancy was something that they very much wished and prayed for,” the source says. “The day they found out that Hailey was pregnant was the best day ever for Justin. He was over the moon with excitement. It was a big celebration for them.”