CNN, BBC and the Guardian have alerted their millions of readers worldwide of the arrival of Prime Minister Jacinda Ardern and partner Clarke Gayford's new baby girl.

Breaking news banners have popped up across multiple international news outlets following the birth of Ardern's baby at 4.45pm on Thursday.

"Welcome to our village wee one," Ardern wrote on Instagram at 6.15pm on Thursday.

Jacinda Ardern and Clarke Gayford with their new baby girl. (Photo / Instagram)

The little girl - whose name has yet to be announced - was born at 4.45pm.

"Thank you so much for your best wishes and your kindness. We're all doing really well thanks to the wonderful team at Auckland City Hospital."

Jacinda Ardern: New Zealand PM gives birth https://t.co/oBY4rrDyc2

— BBC News (World) (@BBCWorld) June 21, 2018

BBC zeroed in on the fact Ardern was the second elected world leader in modern history to give birth while in office, CNN also took a similar approach.

JUST IN: New Zealand Prime Minister Jacinda Ardern becomes the first world leader in nearly 30 years to have a child while in office. She gave birth to a baby girl on Thursday. https://t.co/Gmc92bMknf pic.twitter.com/WLQZkQYTAb

— CNN International (@cnni) June 21, 2018

The New York Times also had their own story reporting the event as well as a breaking news banner from the Associated Press.

BREAKING: New Zealand Prime Minister Jacinda Ardern gives birth to a girl at Auckland City Hospital.

— The Associated Press (@AP) June 21, 2018

Australian talk show The Today Show also extended well wishes to the couple.

Congratulations to New Zealand Prime Minster Jacinda Ardern who has given birth to a healthy baby girl! We wish you and your partner all the best. ❤️ #9Today https://t.co/eTxq0vTg5g

— The Today Show (@TheTodayShow) June 21, 2018

"Congratulations to New Zealand Prime Minister Jacinda Ardern who has given birth to a healthy baby girl! We wish you and your partner all the best."

Kenyan news channel STN Somali TV also reported the news.

#NewZealand Prime Minister Jacinda Ardern gives birth to a baby girl, but plans to be back at her desk in six weeks' time. #AklConversations pic.twitter.com/XVahZzdEt3

— STN Somali TV (@STN_KE) June 21, 2018

News outlets from Nigeria, the Philippines and India also weighed in.

New Zealand Prime Minister @jacindaardern gives birth to first child https://t.co/x2WRFotWCV via @TOIWorld pic.twitter.com/zX0yyVTeiE

— Times of India (@timesofindia) June 21, 2018

New Zealand Prime Minister Jacinda Ardern gave birth to a daughter Thursday and posted a photo welcoming the healthy newborn "to our village." | https://t.co/xYqLAwrPqG pic.twitter.com/SKHySEGWiB

— SunStar Philippines (@sunstaronline) June 21, 2018