New Zealand's Prime Minister Jacinda Ardern addresses the 73rd session of the United Nations General Assembly at U.N. headquarters in NY, U.S., September 27, 2018.
"It is totally unacceptable in 2017 to say that women should have to answer that question in the workplace", she told the presenter, although she said she was in a different situation as she "opened myself up to it".
"Oh, absolutely. Absolutely I'm a feminist", Ardern responded.
As New Zealand's prime minister, Jacinda Ardern regularly has to field questions from journalists, but the last line of questioning is raising eyebrows.
Ms Ardern drew on her country's strong links with the United Kingdom and the two nations' shared history before saying the relationship must evolve and grow when the United Kingdom leaves the European Union on March 29.
Then the female interviewer, Victoria Derbyshire, asked Ardern if she had plans to ask her partner Clarke Gayford, a fishing show host, to marry her. "But no, I want to put him through the pain and torture of having to agonise about that question himself".
Derbyshire replied: "Fair enough, we await that day".
The biggest praise of the day, however, came from Sir David Attenborough who left the prime minister chuckling after he described the knees of rats shaking whenever New Zealand is near.
New Zealand's Prime Minister Jacinda Ardern said on Monday she was concerned about the prospect of Britain leaving the European Union without a withdrawal deal.
"Now, a male foreign PM would absolutely not be asked those last two questions".
Ms Ardern has met Theresa May in London this week and is attending the World Economic Forum in Davos.
The BBC raised a lot of sensitive gender politics in a time when there's a lot of heightened sensitivity about the role of women in politics and the public sphere, he said.
The prime minister is taking part in a panel focused on mental health with Prince William tomorrow.
She has faced questions about the pressures of motherhood after becoming only the second elected world leader to give birth while in office.