Stephen Colbert and Jacinda Ardern carpool karaoke Bohemian Rhapsody

Popular talk show host Stephen Colbert's new episode features his adventures in New Zealand.

The Prime Minister picked up the biggest name in late-night television at Auckland Airport when he arrived here last month. 

A clip of the episode shows them singing Bohemian Rhapsody and joking about New Zealand politics. 

"How cool would it be if you called the election now on TV," Colbert said. 

However, the discussion took a serious turn when the topic of gun control arose. 

"You immediately passed gun reform, banning all military-style assault rifles," said Colbert. 

"My immediate reaction was that just can't stand, that has to change," replied the Prime Minister.

The Late Show is the most popular late-night talk show in the US with more than four million viewers tuning in every night. 

Ardern has appeared on the talk-show host's programme twice, while Colbert has confessed his love for New Zealand, even featuring as an extra in The Hobbit movie. 

Tourism New Zealand estimates the media stunt is worth $5 million in advertising.

The visit will cost taxpayers $100,00.