James Corden has had many stars sitting in his passenger seat as part of his hugely popular Carpool Karaoke, but he scored his biggest hit yet when he got the First Lady to belt up and belt out Stevie Wonder as he drove her around the streets of Washington DC.
Thirty-four million people have viewed the video of Michelle Obama rocking out to her favourite singer just one week after it first aired.
Carpool Karaoke has become an online phenomenon. The segment, which plays as part of Corden's Late Late Show, features the host driving around in a car with celebrity guests singing their favourite tunes. The successful segment has featured some of the biggest names in music and film, including Justin Bieber, Stevie Wonder, Tom Hanks, One Direction and Adele.
Collective YouTube views of all Carpool Karaoke videos have reached more than 830 million, which underlies both its popularity and its potential to make money. With every thousand views equating to $2 (£1.50), Carpool Karaoke's worth currently stands at £1.2 million. Corden's segment with Adele - where the singer rapped along to Nicki Minaj's 'Monster' - is the most viewed online clip late-night television clip ever.
The success of the show is largely down to its intimacy, that shakes off the usual host-at-a-desk-questioning-a-guest format, and Corden himself, whois clearly enjoying the company of his passengers every bit as his audience.
Such is the segment's success, that Apple have bought a Carpool Karaoke spin off show that will stream exclusively on Apple Music.
Corden will be producing, but not presenting, the new show, but whether it's Stevie Wonder singing 'I Just Called To Say I Love You' down the phone to Corden's wife or Jennifer Hudson crooning a burger order, Carpool Karaoke's global appeal is set to continue in the fast lane.
ITV reporter, Ivor Bennett reports: