Clarkson's appointment was announced live on air, and she is set to join Hayley Holt, John Campbell, and Matt McClean this week, before jetting off to Tokyo for the Rugby World Cup.
"I'm not Daniel [Faitaua]. I love Daniel, but what I will bring is the same 'keeping it real'," she told Campbell and Holt during the live on-air announcement.
The Breakfast team farewelled Daniel Faitaua in an emotional goodbye last week.
Executive producer of Breakfast Jonathan Williams said the Breakfast team "couldn't be happier" to have Jenny-May Clarkson as the show's newsreader.
Williams said Clarkson has had a unique path to job, going from an "elite athlete, to police officer, to sports journalist."
"That's part of what makes her such a special broadcaster," he said.
Jenny-May Clarkson officially starts the role on September 30.