Jacinda Ardern

'Kia ora Jacinda!' - Rihanna hits up the Prime Minister on Twitter

"Kia ora @jacindaardern!," she wrote.

"It's been a big year for you & [New Zealand] - congrats!"

The 'Diamonds' singer told Ardern her year could "get even better" if she pledged funds to the Global Partnership for Education.

"I hope you & @MFATgovtNZ agree that educating every child can change the world!" she added.

The organisation is working alongside Rihanna's own charity, the Clara Lionel foundation, to provide education for children in poor countries around the world.

'Honour and a privilege' - Jacinda Ardern

"Mr English has already called me this evening and acknowledged that for the national party negotiations have now concluded," Ms Ardern said.

At a long-awaited press conference at the Beehive Theatrette earlier this evening, New Zealand First leader Winston Peters announced the party had decided to go with Labour.

Labour has 46 seats, which together with the Green's eight and New Zealand First's nine, gives them 63 seats in the house, and a majority of seven over National.