April 16, 2016 08:45 AM

With two children (and a third on the way) with his estranged wife Megan Fox, Brian Austin Green is simply beaming about the fact that he is going to be a dad again.

Even if it wasn’t exactly planned.

“You know, nothing is planned,” he told PEOPLE exclusively at the Toyota Grand Prix of Long Beach Celebrity Race, which was hosted by the Verizon IndyCar Series, on Friday. “None of them are ever planned. You kind of just go with it.”

“At my age, to be having three babies, is crazy,” the actor, who is already dad to sons Noah and Bodhi, said with a laugh. “I’ll be 43 this year.”

Albert L. Ortega/Getty

It was revealed earlier this week that Fox is pregnant with the couple’s third child — even though she filed for divorce from the 90210 star in August.

“They never stopped loving each other and they will never stop being devoted parents to their boys,” a source previously told PEOPLE.

At Friday’s event, Green said that he has learned “everything” since becoming a dad — especially when playing it safe at a race event.

“It used to be just the rush of doing it,” Green says of picking up race car driving as a hobby. “You know, it’s a different feeling, a different rush than you are used to, and now that I’ve got all the kids that I have it’s like, ‘Yeah, this is fun…’ “

Green adds that being a father means that he does try to be safe so he can get home to his little ones.

“It’s important that I live,” he says with a laugh.

On Saturday, Fox was by Green’s side to cheer him on while he took part in the celebrity race.

“Megan looked amazing,” an observer tells PEOPLE. “She was in a great mood too. She seemed to enjoy the event. She watched the race from the sidelines.”

— Reagan Alexander

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