Jacinda Ardern pregnant

Twitter reacts to Ardern baby news: 'Such a great role model'

Ms Ardern, who became Prime Minister in October, announced this morning, via Instagram, that she and partner Clarke Gayford were expecting a baby in June.

Former Prime Minister Helen Clark was among the first of many to congratulate Jacinda Ardern on her pregnancy.

Ms Clark said via a tweet it was going to be a "super busy year" with "much to look forward to".

"Every #woman should have the choice of combining family & career."