The Thor star's wife Elsa Pataky gave birth to a baby girl called India, who was reportedly born on Friday in London.
Hemsworth admits he feels grateful to have finally become a father, and reveals the baby would have been called Indiana if it had been a boy.
He tells E! News, "It was just a name we liked, I always kind of liked Indie or Indiana for a boy and she liked India. We sorta went, 'Oh well, whether it's a boy or girl that will decide.' It just seemed to fit... I've wanted to have kids for a long time, and here it is, and I couldn't be happier... It's amazing, it's really, really exciting... it's tough being (away from) her."