Baby Axl is growing up so fast! Fergie and Josh Duhamel took their son out for a day of bonding at a local park in Brentwood, California over the weekend.

"The 40-year-old Black Eyed Peas star and her movie star husband spent the day doting on their cherubic tot, taking him to a park to practice his soccer skills," Daily Mail noted.

For the outing, the former Black Eyed Peas singer donned camo sweater and torn jeans, which she paired with high-top shoes. "Battle Creek" actor Josh Duhamel, meanwhile, opted for a more sporty look with a black tracksuit.

"The couple proudly snapped away on their phones as their 21-month-old boy kicked a ball about in his white soccer strip," the British tabloid said.

"Earlier in the day Josh lead a one-mile run/ walk - named the Josh Duhamel Relief Run - in Santa Monica to raise funds to aid the Nepal earthquake recovery."

Josh Duhamel said in an earlier interview that he and Fergie are looking at giving Axl Jack a baby brother or sister.

"She's recording and probably going on tour," Josh Duhamel said of wife Fergie in an Extra TV interview. "And the plan is sometime after that, maybe before. Maybe I can knock her up tonight."

In a Reddit Q&A to promote "Battle Creek," Josh Duhamel weighed in about being a father to baby Axl to his son with Fergie.

"What surprised me the most about being a father... I would say just the fact that - how quickly they actually develop, and become walking, talking little human beings that are suddenly living with you until they're at least 18!" he wrote.

In an appearance on Ellen DeGeneres' show, 42-year-old Josh Duhamel talked about enjoying every little milestone that baby Axl takes.

"He's swimming, he likes to stick his fingers in holes, he loves to pick my nose. He's also defiant. They get to certain age, they like to test you a little bit," Fergie's husband said.