Sources close to Kelly Osbourne say the star’s seizure last week may have been caused by epilepsy.
Last Friday, the 28-year-old was rushed from the set of her TV show Fashion Policeafter she collapsed out of her chair and began convulsing in a seizure that lasted 30 seconds.
According toKelly’smother, Sharon, the star is doing well, but remains in hospital for testing.
"I want to thank everyone for their concern about @MissKellyO," the 60-year-old tweeted. "She's doing fine she's at Cedars and is surrounded by the best doctors & love."
"They are running every possible test," the source told US Weekly. "Could be epilepsy, but also could be an allergic reaction or something else."
Before the star collapsed on the show, she spoke to fellow host, Melissa Rivers telling her, "I don't feel good”.
A source close to the family adds, “Nothing like this has ever happened to Kellybefore and she was really scared.”