Kelly Osbourne’s publicist had early tried to play down the incident after dramatic images emerged of the 28-year-old being carried off set to an ambulance.
The star cleared up all doubt when she took to Twitter to explain to well-wishing fans what had happened.
She wrote: “Thank U all 4 UR beautiful well wishes yes I did have a seizure they are just trying to figure out why?”
Kelly Osbourne, the daughter of Ozzy and Sharon Osbourne collapsed while filming her E! show Fashion Police, and was taken to a Los Angeles based hospital where she was expected to stay overnight.
She was recording the latest episode of the style programme alongside Joan and Melissa Rivers, who has been covering for usual panelist Giuliana Rancic.
Kelly Osbourne reportedly turned to the star and told her she didn’t feel well, before she fell out of her chair shaking.
An audience member happened to be a doctor and reportedly fled to her aid.
Kelly Osbourne came around a few moments after the seizure, but her team wanted her to go to hospital for tests and supervision.
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