She explained: "Sometimes I got onto him and said, "I don't want to hear that song again".
Sir Paul McCartney climbed in next to Corden, revealed tidbits about himself and the Beatles, and crooned show-themed songs such as "Penny Lane" (the actual road they were driving on) and "Drive My Car", per USA Today.
"That's been one of the unusual things", McCartney, around the five-minute mark in the video up top, told Corden of the lasting impact of the Beatles' message.
Corden said it was the "most lovely story" he had ever heard, before singing a teary rendition of the song.
The pair started the show singing the Beatles hit Drive My Car, while cruising through the city, replacing the song's "beep beeps" with honks of the horn.
Carpool Karaoke was clearly Corden's breakout, but I like how he's used the segment not as a senseless gag to boost YouTube views, but as a real opportunity to get to know the guests that ride around in the auto.
In between songs, McCartney autographs the Penny Lane wall and visits his childhood home. Their duet left Corden in tears: "That's the power of music", said McCartney. McCartney replied. More from their joy ride here. "My dad would be in there (the next room) watching telly, we'd be in here, and we'd just written She Loves You, which was a big Beatles hit".
Nostalgia was certainly in the air as they came to St. Barnabas' Church, where McCartney reminisced about his choir boy days. "If my granddad was here right now, he'd get an absolute kick out of this".