Simon Cowell broke his back falling off his new electric bike in the backyard of his home in Los Angeles.
The 60-year-old music mogul has been rushed to hospital and is undergoing surgery, his spokesperson said.
“He is fine, he is under observation and is in good hands,” she said earlier.
Cowell, best known for his hit shows The X Factor and Britain’s Got Talent, goes on lockdown in the United States, where he now lives.
“Simon broke his back and is undergoing surgery this evening,” confirmed his spokesperson shortly after arriving at the hospital. Surgery began Saturday night Los Angeles time.
Piers Morgan was among those who wished Cowell “a full and speedy recovery” on social media.
Cowell, who has six-year-old son Eric with partner Lauren Silverman, is said to have tested his new bike when the crash happened.
He had a previous fall in 2017, when he fell down the stairs at his London home.
“Sometimes we get a reminder that we are not invincible and that it was definitely mine,” he told the Sun newspaper at the time. “It was a huge shock.”
“They think I passed out because I had low blood pressure and so I really need to take good care of myself to get this problem out,” he said.
“After all, I am a dad and I have more responsibilities than ever.”
Cowell was set to appear as a judge on the live broadcasts of America’s Got Talent’s latest series, which are set to begin in the United States next week.
Last month, the mogul signed a deal with Sony Music Entertainment giving his company Syco Entertainment ownership of all international versions of The X Factor and Got Talent programs.
The Got Talent format airs in 76 markets, while The X Factor airs in over 130 territories.