X Factor boss Simon Cowell has broken his back in an electric bicycle accident in California.

US entertainment trade website the Hollywood Reporter says the record executive was test-riding his bike at home in Malibu when he fell.

"Simon had a fall from his bike on Saturday afternoon whilst testing his new electric bike in the courtyard at his house in Malibu with his family," a spokesperson said.

"He hurt his back and was taken to the hospital. He's doing fine, he's under observation and is in the best possible hands."

In later correspondence with the Hollywood Reporter, the spokesperson added: "Simon has broken his back and will be having surgery this evening [Saturday]."

Cowell had been due to film the first live show of the new series of America's Got Talent in California this Tuesday.