Proud parents Josh Duhamel and Fergie welcomed their first son, Axl Jack, in August, and are already planning for their next child.

According to Yahoo, the little Axl Jack is extremely well-behaved, but the couple worries their next child won't follow in his footsteps. "He's a really good little baby, which means the second one will be a holy terror!" Duhamel said at the Wallis Annenberg Inaugural Gala in Beverly Hills on Thursday. "But, so far so good. We're beyond happy."

When asked about making continuing to add to the family, the 40-year-old said, "Of course! Yeah, we've gotta move fast."

The Associated Press reports that the proud dad loves hanging out with his little man, but even though he and his wife are planning for another one right away, he still plans on pushing himself in his career. "No I'm not going to let that affect the way I make decisions creatively," Duhamel said of being a dad. "I still want to push myself and do things that I would never, that I would never thought that I was able to do."