We gotta feeling this is going to be a birthday party to remember.
In pictures posted on social media, fans were able to relive the sun-filled day that included plenty of treats, Hawaiian shirts and activities for all ages.
"Happy 6th Birthday to the love of my life #AxlJack," Fergie wrote on Instagram. "#AxlsIsland."
Josh Duhamel also took to social media and wished his son a special day. "Can't believe this little dude is 6 today," the actor wrote on Instagram Stories with a throwback clip of his boy. "Happy Birthday Axl Jack!"