Jacinda Ardern was sworn in as the 40th Prime Minister of New Zealand this morning at Government House.
The rest of the Government Executive was also sworn in at the official ceremony in Wellington.
The new Cabinet will meet for the first time at Parliament this afternoon, and Jacinda Ardern will give her first news conference as Prime Minister.
4:00pm - Ardern's high school teacher attended swearing in ceremony
Jacinda Ardern's former teacher Gregor Fountain watched her become Prime Minister this morning.
He taught Ms Ardern social studies and history for three years at Morrinsville College. Mr Fountain said it's a "pretty satisfying experience" to see her take up the top job even though it makes him feel old.
"It's such a tribute to Jacinda that she would think about even inviting her teacher. It shows her breadth, and that's an exciting thing for the profession I reckon."
Mr Fountain said she was a "community builder...someone who looked for people on the edges of our school community and brought them in."
He said many of his colleagues "honoured" that she chose to invite him.
3:50pm - Jacinda Ardern's father says becoming Prime Minister "in her DNA"
Jacinda Ardern's father Ross Ardern was at Government House to watch her be sworn in as Prime Minister this morning.
"It was very emotional, a wonderful experience and I enjoyed it a great deal," Mr Ardern said.
"I always knew that she was destined for high office, it was in her character and in her makeup, she was always going to shine."
Ms Ardern's mother couldn't attend the ceremony as she's in London with the Prime Minister's sister, who gave birth today.
"It's in her DNA. She will work hard for everybody," he told Newshub.
3:30pm - "My job is just to make sure she's ok" - Clarke Gayford
"I think the big grin on my face says it all. I'm still coming to terms with it really, but enormously proud," Jacinda Ardern's partner Clarke Gayford said.
"My job is just to make sure that she's okay and to be in the background going have you eaten your lunch? Have you slept properly? You've got lipstick on your teeth. That's my job."
3:20pm - Here's Prime Miniser Jacinda Ardern, Deputy Prime Minister Winston Peters and the Cabinet Ministers at their first meeting.
2:30pm - Jacinda Ardern's Morrinsville College teacher Mr Fountain, her best friend, her father Ross, and her aunt Maree at Parliament:
2:20pm - "A Government for all New Zealanders" - Ardern
Prime Minister Jacinda Ardern told the crowd gathered at Parliament to welcome her that the new Government would be "strong", "active" and "empathetic".
"Not everybody voted for us. This is a democracy - of course not everybody voted for us... But this will be a Government for all New Zealanders," she said.
Ms Ardern told the crowd "Work begins today...There will be good days and there will be bad day but I can tell you that no matter what we will always remember the vote you gave us".
Her last words were a continuation of Labour's campaign slogan: "Let's go and do this".
1:20pm - Hundreds wait to welcome new Government at Parliament
A crowd of hundreds has formed at Parliament's forecourt, waiting for the newly sworn-in Prime Minister to arrive and to welcome the new Government.
There are several hundred people waiting out the front of Parliament, and staffers watching from the Beehive balcony.
11:26am - Jacinda Ardern is now the Prime Minister of New Zealand, and Winston Peters is the Deputy Prime Minister.
10:56am - The new Government will have 13 Māori and Pacific Ministers.
10:52am - Jacinda Ardern is on her way to Government House from Parliament. The ceremony, officiated by Governor General Dame Patsy Reddy will begin at 11:00am.
10:35am - Former United First leader Peter Dunne said he's "cautiously optimisitc" about the new Government, but less so about the New Zealand First component.
New leader Damian Light said he sees "potential for positive change but also to be dragged down".
10:20am - Jacinda Ardern's partner Clarke Gayford, his three-year-old niece, her father, and one of her former high school teachers will be among those attending the ceremony to watch her be sworn in as Prime Minister.
10:15am - Bill English has been to Government House this morning to officially resign as Prime Minister of New Zealand, ahead of the swearing in ceremony for the 52nd New Zealand Government.
Mr English also took a "last chance" photo in the Prime Minister's office.