Sophia Michaels
wrote via Instagram Tuesday alongside a black-and-white photo of the birthday boy.
“Happy 10th birthday punky!!! I love you Axl Jack 🎂🎂.”
The carousel also included a snap of the 10-year-old dressed up as Batman while he rode around in his own mini Batmobile.
More shots showcased the youngster’s athletic side as he posed in a soccer uniform with his friends.
Fergie, whose real name is Stacy Ann Ferguson, shares her only child with ex-husband Josh Duhamel.
The former couple began dating in 2004 and tied the knot in 2009.
The exes called it quits in 2017 after eight years of marriage.
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“With absolute love and respect, we decided to separate as a couple earlier this year,” the pair said in a statement to US Weekly at the time.
“To give our family the best opportunity to adjust, we wanted to keep this a private matter before sharing it with the public. We are and will always be united in our support of each other and our family.”
Despite their split, the two have maintained an amicable co-parenting relationship for Axl.
Speaking to Fatherly in January, Duhamel, 50, revealed he and Fergie, 48, agreed on specific rules for dating other people after their divorce.
“Fergie, she was very much, ‘No matter what, we have to be civil for Axl,’” he explained.
“She was very adamant about not letting him meet people I was dating until we’d been dating for six months or something. Or was it four months? I forget. I dated a couple of girls, and he never got to meet them. Which I’m glad,” he added.
The “Transformers” actor announced his engagement to Audra Mari in January 2022 after nearly three years of dating. The two wed in North Dakota that September.
Meanwhile, Fergie has not been romantically linked to anyone in the public eye since their divorce.
