"Just let it be", he said she told him in the dream - which of course then inspired the famous song.
Paul McCartney joins James Corden on very memorable episode of Carpool Karaoke.
The segment climaxed with Paul returning to one of the pubs Paul used to play before The Beatles hit the big-time, surprising the locals with a performance with his current band - singing hits decided by the audience via a jukebox.
Corden responded, "That's the most handsome story I've ever heard", and then the two sang the song together.
"I had a dream in the '60s where my mom, who died, came to me in the dream and was reassuring me, saying, 'it's gonna be OK".
"That's the most attractive story I've ever heard", Corden said before the two broke out in an emotional duet of "Let it Be" that brought tears to talk show host's eyes as he drove.
After the unusually heartfelt moment, the segment continued on in a lighter mood, as the host and the music icon drove around Liverpool visiting all the places that played a significant role in the history of The Beatles.
Corden said it was the "most handsome story" he had ever heard, before singing a teary rendition of the song. While there, Paul explained how he and John Lennon had rehearsed their first Beatles songs in the living room. I didn't see that one coming round the corner. "She gave me the positive word. I'll never ever forget it. Take a breath and jump in", Corden tweeted on Thurs. "And I remember them playing that".
Shocking the homeowner with an impromptu visit, McCartney shows Corden around the house. McCartney sang A Hard Day's Night, Love Me Do, Back in the USSR and Hey, Jude to a shocked crowd at the pub.