Ms Ardern last week named the Labour MPs who would become ministers, but not their portfolios.
Under its coalition deal with Labour, New Zealand First has been allocated 13 portfolios among four ministers, including regional development, defence, infrastructure and forestry.
Look back on developments with RNZ's blog:
Watch: NZ First on ministerial announcements
Earlier, Green Party leader James Shaw spoke to the media:
Jacinda Ardern reveals her government's new ministerial line-up