In an interview with Daily Star, the British hitmaker spoke of his shock at learning who he was speaking to.
Paul recalled: "Somebody rang me up, and this high voice I didn’t recognise said, ‘Hi, Paul.'
"I thought, ‘This is a girl fan, and how the hell did she get my number?’ I was quite annoyed," he admitted.
The former Beatles member revealed who was actually on the other end of the phone.
Yesterday hitmaker Paul McCartney didn't recognise the 'softly-spoken' voice on the end of the phone (Image: GETTY)
He explained: "Then the voice said, ‘It’s Michael,’ and suddenly it dawned on me.
"It wasn’t a girl, it was Michael Jackson, and he basically said, ‘Do you want to make some hits?’"
Source: Sabina Rouse/express.co.uk