Osher Günsberg's beautiful tribute to his wife and their new baby boy

Osher Günsberg and wife Audrey Griffen have welcomed their first child, baby "Wolfie" Wolfgang.

The Bachelor Australia host shared a welcome to his new son on Instagram several hours ago – and with it, a moving tribute to Griffen.

"I am in complete awe of my wife," he wrote.

"What I witnessed her do, the power I saw her summon from within her to bring this boy into the world was utterly astonishing. ⁠⁠As he came closer and closer, her body began to unleash an incredible energy that was absolutely not going to be held back. ⁠⁠

"Yet Audrey was able to harness it, guide it, and use it to transcend the extraordinary pain she was feeling and channel it all towards an energy that brought this boy alive and well into the world.⁠"

Günsberg and Griffen met on the set of The Bachelor in 2014.

"That I've known Audrey for over five years, and yet had no idea that within her this whole time was an almighty divine force capable of bringing life into the world like this blows my mind and was astonishing to witness," he wrote tonight.

"⁠⁠I can't think of any single thing a man does in his life that physically equates to what I saw Audrey do. ⁠⁠

"For me – any marathon or endurance event I've ever raced is essentially a wander to the kitchen compared to what I saw Audrey do on Friday."

Günsberg also gave a shout-out to his step-daughter Georgia, Griffen's teenage daughter from a previous relationship.

Her "perfect playlist" greeted baby Wolfie with Kendrick Lamar, Beyoncé and Khalid, Günsberg wrote. "She's the best big sister he could have ever hoped for."

The ecstatic new dad added a joyful sign-off:

"We are in love and drowning in gratitude, oxytocin and new baby smell."