Prime Minister Jacinda Ardern has announced she is pregnant and the baby is due in June.

Ardern shared the delightful news on social media saying that she was really excited about the pregnancy.

"And we thought 2017 was a big year! Clarke and I are really excited that in June our team will expand from two to three," she wrote on Instagram.

The post was also shared on her Twitter and Facebook accounts.

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New Zealanders took to the social network to react to the news and congratulate the couple.

Australia's Prime Minister Malcolm Turnbull tweeted his congratulations, even though they spoke on the phone this morning.

While former NZ Prime Minister Helen Clark also sent her best wishes to the happy couple.