The Green Party Minister Julie Anne Genter says she has gone into hospital to have her baby induced.
The Minister for Women and Associate Minister for both Health and Transport announced her news on social media.
She shared a photo of herself cycling to the Auckland City Hospital, where she is going into induced labour.
Ms Genter and her partner Peter Nunns cycled to the hospital because there wasn't enough room in the car for the support crew, she said.
Green Party co-leader James Shaw said it was very 'on-brand' for Ms Genter to have chosen to ride her bike.
"I'm proud to be living in a country where two members of the country's executive are able to have children as part of their job," he said.
"I just think it's fantastic news and we wish her all the very best."