Prime Minister Jacinda Ardern has been named one of the most influential under-40s in the world by Fortune magazine.

The American multinational business publication named the 37-year-old at number 12 in this year’s ’40 under 40′ list, which it has just published.

The list is headed by Facebook founder Mark Zuckerberg and Instagram co-founder Kevin Systrom.

The magazine said it was only appropriate that Ardern, a one-time DJ, became a “rock star of New Zealand politics”.

Her partner Clarke Gayford seemed impressed, joking that he was “just pleased I had paid my student loan off” by the time he turned 40.

“Her fervent support among Kiwis, dubbed Jacindamania, helped reverse her Labour Party’s ailing fortunes this fall and catapulted her to the title of world’s youngest female leader,” Fortune said.

“The buzz continued when she announced her pregnancy and in June painted a once-in-a-generation vignette: a female head of government, cradling her newborn and embarking on six weeks of maternity leave.

“Her time off is flexible, it seems. In July she announced welfare reforms – including a weekly stipend for new parents -as part of Labour’s promise to improve well-being in a nation that’s grappling with housing and immigration crises.”

It is the first time Ardern has featured on the list.