The Transformers actor uploaded a father-son photo to Instagram on Sunday (6 October), showing himself and little Axl snuggled up together.
He added the caption: "Gonna catch some football with my little guy today."
Josh and his Black Eyed Peas wife Fergie became first time parents in August when Fergie gave birth to Axl Jack in Los Angeles.
Since then, Fergie has been keeping a relatively low profile, while doting dad Josh has been out and about a few times, most recently at a Hugo Boss store launch in Manhattan.
The new parents were spotted enjoying a date night together on 25 September; the first time we've seen Fergie since the birth.
Earlier that week, Josh had told E! News: "She is doing so great, she really is. She is happy, she looks amazing for three weeks ago she gave birth. She looks probably better than she did before. I don't know if it's because of what she's been eating but she looks really great."
Fergie and Josh aren't alone! More stars who have become parents in 2013:
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