New Zealand Prime Minister Jacinda Ardern and her partner Clarke Gayford are expecting their first child in June.
The Prime Minister used three fishing hooks in a post to all her socials, a hint towards her and Clarke's love of fishing.
It will be the first child of Jacinda and Clarke's.
Deputy Minister Winston Peters will step into Jacinda's place while she is on maternity leave.
"Yesterday, I met with [Mr Peters] to share the news and to ask him to take on the role of Acting Prime Minister for a period of six weeks, after our baby is born."
Last year, Jacinda Ardern made headlines worldwide when she argued with Mark Richardson about the need for employers to know about a woman's plan on having babies.
"I think it's a legitimate question for New Zealand, because she could be the Prime Minister leading this country. She has our best interest at heart. We need to know these things," Mark Richardson told audiences on The AM Show.
"If you're the employer at a company, you need to know that type of thing from the women you're employing," he argued, to a chorus of, "No. No, no, no, no, no," from co-host Amanda Gillies.
When she appeared at the desk for her interview with Duncan Garner, Ms Ardern addressed Richardson directly.
Ms Ardern told Garner it's not an inappropriate question to ask her because she's spoken about it openly before.
"But, you," she said, pointing at Richardson, "for other women, it is totally unacceptable in 2017 to say that women should have to answer that question in the workplace. That is unacceptable in 2017. It is the woman's decision about when they choose to have children," she said.
"It should not predetermine whether or not they get the job."
Watch Jacinda Ardern argue against Mark Richardson on The AM Show from last August below: