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Cowell, 60, had been riding his electric bike around the courtyard of his home when he had a fall.
The entertainment mogul was then taken to hospital, and was thankfully said to be doing 'fine' as he awaited surgery.
Simon's representative told People: "Simon has broken his back and will be having surgery this evening."
The rep continued: "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.
"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."
Earlier this year, Cowell told People that he'd been enjoying more activities like cycling during the coronavirus pandemic, as well as spending more time with his girlfriend Lauren Silverman, their six-year-old son Eric and Silverman's 14-year-old son Adam from a previous relationship.
On his exercise routine, he said: "Cycle, walk, swim, push-ups. I haven't cheated on my diet.
"I feel really healthy at the moment."
Cowell continued: "We definitely have more family time together now.
"We watch movies in the evening, play together, read books, comics, everything."
According to People, Cowell is scheduled to film America's Got Talent's first live show on Tuesday at Universal Studios in California, with production set to resume following delays to the schedule thanks to coronavirus.
During the pandemic, the entrepreneur also called on celebrities to pay staff and not use taxpayers' money, agreeing to pay 50 full time members of staff who work at his production company, Syco, in London and Los Angeles.
Despite production ending on his TV shows in both the UK and US, he assured staff they won't be placed on furlough.
According to The Sun, Cowell said: "I don't like celebrities telling people what to do, and I know this is a hugely difficult time for so many - worries about family, health, jobs, paying the mortgage and feeding their family are at the forefront of people's minds.
"But there are still other people in business and in entertainment with resources available, so today it's those people I'm urging to rise to this enormous challenge."
The Daily Mail also reported that he donated £1.6 million from his personal fortune to charities in desperate need of cash.
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