James Corden revealed Stevie Wonder serenaded his wife while she was on the toilet.

James and Julia Corden

James and Julia Corden

'The Late Late Show' host was joined by the 71-year-old singer for 'Carpool Karaoke' in 2015 when Stevie called James' wife, Julia, to sing 'I Just Called To Say I Love You' down the phone to her.

James thought it would be a magical moment but Julia was actually in a bathroom at a restaurant when she picked up the phone.

Appearing on 'The Ellen DeGeneres Show', James revealed: “What’s on TV was really moving, I couldn’t help but be overwhelmed with it. So much of my life, I just think, ‘If this was an auction prize, this would go for millions of dollars’. Stevie Wonder is going to call your wife and sing ‘I just called to say James loves you’. I don’t know what I’ve done to deserve so many memories.

“What I didn’t know when I got home is my wife was actually in a bathroom stall when the phone rang. I had this gorgeous image of her being completely overwhelmed with emotion but she was literally in a toilet at a restaurant. And I’m glad I didn’t know that at the time because it was so moving when it happened in real life.”

Meanwhile, the 'Gavin and Stacey' star revealed that the musical segment is set to make a return this summer after it was put on hold due to the coronavirus.

He said: “I don’t know really, we wonder when someone will tell us it’s OK. I don’t know, I’m hopeful for the end of summer or autumn time that we’ll be able to do it again.

“It feels like there’s a whole raft of artists that we’re desperate to do it with that have had the most incredible last few years.”

James added: “I hope so much we’ll be able to do it before the end of the year. I hope.”