Friendly exes Fergie and Josh Duhamel reunited Saturday at their son's birthday party.

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The 43-year-old singer and 45-year-old actor threw Axl Jack a superhero-themed fete ahead of his fifth birthday. Axl officially turns five on Wednesday.

Fergie shared a photo on Instagram of herself and Axl at the celebration. "The Four" host dressed up as Wonder Woman, while Axl wore a Spider-Man costume.

"happy bday party day to my favorite superhero #axljack," Fergie captioned the post.

Duhamel thanked Coolhaus ice cream for providing the desserts. The premium ice cream company was founded by Natasha Case and Freya Estreller in 2009.

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"Thanks for showing up for my boy's birthday party @coolhaus kids went crazy. (Love you AM) #ibuywomenowned," Duhamel wrote.

Fergie and Duhamel announced their split in September after more than eight years of marriage.

Duhamel told E! News in January he has maintained a "great relationship" with Fergie since their divorce.

"It's going really well," the actor said. "She's a great mother."


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"All we want is the best for our son, so it's a bit of a juggling act but we're both grownups who can handle a lot," he added. "And he's happy. That's the main thing."