The Black Eyed peas star shared the cutest snap of baby Axl on Twitter, which was the perfect birthday greeting for Josh!
Axl, who was born on 29 August, can be seen staring straight into the camera and beaming with a huge smile on his face. So cute!
Captioning the snap, Fergie wrote on Axl's behalf: "HAPPY BIRTHDAY DADDY!!!! @joshduhamel."
Safe Haven actor Josh, who turned 41 on Thursday (14 November), took advantage of the hot weather and spent the rest of his day hitting a golf course in California with friends.
First-time dad Josh has really embraced fatherhood and gushed about his bond and love for Axl in an interview last month.
"He just smiled yesterday for the first time, but everything leading up to that was great," Josh told E! News. "I just recommend it to anybody out there who hasn't done it."
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