New Zealand Prime Minister Jacinda Ardern is in labour and in hospital to give birth to her first child.

The Prime Minister’s Office confirmed that Ardern arrived at Auckland hospital, with her partner Clarke Gayford, to have her baby, early this morning.

Deputy Prime Minister Winston Peters is now Acting Prime Minister.

The PM's office says there will be no further formal announcements from the Prime Minister’s office till Ardern and Gayford announce the birth of their baby.