The Black Eyes Peas frontwoman, 38, wrote, “hello world!!!! #daddyandmommymademedothis #whatsahashtag.”
Last week, Fergie and her husband, Safe Haven star Josh Duhamel, introduced their newborn son via social media.
The Transformers actor, 40, opened up to Celebrity Baby Scoop just days before Axl’s August 29 birth.
“I’m taking a lot of time off after the baby’s born,” Josh shared. “I don’t want to miss anything!”
He went on to gush about his lovely wife. “She’ll be great. I have no doubt that she’ll be an amazing mom,” he said.