Josh Duhamel and Wife Audra Mari Welcome Their First Baby Together

The couple shared a photo of Shepherd Lawrence Duhamel's feet, nearly a week after the baby's birth

Josh Duhameland Audra Mari have welcomed their little bundle of joy, Shepherd Lawrence Duhamel.

The Transformersstar, 50, and his wife confirmed the news on Instagram, where they jointly posted a photo of their baby's feet.

The baby was born on Jan. 11, the couple shared in their post's caption.

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.

Duhamel is already dad to son Axl, 10, whom he shares with ex Fergie. The actor's sonhad a sweet reaction to hearing he's going to be a big brother. "He's like, 'Wait, now, am I going to be — You're still going to love me, though, too, right?' ” Duhamel shared in an interview withParade.

“I was like, 'Of course, I'm going to still love you.' And he's like, 'I'm still going to be your firstborn son, though, right?' I'm like, 'Yeah, you're still -

’ French Sales Agents Confront Glo,...

the firstborn son!' ” theShotgun Weddingactor added.

"He's a really sweet kid. And he loves babies!" the father said. "I was the same way at his age. I just have always loved babies. There's something about them. And he's really good with younger kids. So I think he's going to be a great older brother."

In a clip from his appearance onIn Depth with Graham Bensinger earlier this year, Duhamel opened up about the couple's hopes for the future.

When Bensinger said that the actor's sister, Ashlee Duhamel, shared that Josh "always wanted to have eight or nine kids," he replied, "That was when I was much younger."

"I will say, the age thing doesn't normally come into conversation, but it definitely does when speaking of having babies," Mari commented. "I really do believe he would have five more kids if he was even 40 right now. It's probably true. We'll definitely have a few though. Hopefully, God willing."

"That's the hope," Josh added.

What the Pentagon Has Learned? Are UFOs ,...