Kelly Osbourne seizure update: Is the E! star epileptic?

kelly-osbourne-seizure-getty.jpgDuring a taping of Kelly Osbourne's E! show "Fashion Police" last week, the reality star and red carpet mainstay suffered a seizure, falling out of her chair in front of the studio audience. Co-star Melissa Rivers said, "Oh my god, she's having a seizure!" and sat with Kelly until emergency personnel arrived.

Osbourne was immediately rushed to the hospital, with assistants hiding her with a sheet so onlookers couldn't take photos as she was ushered into the ambulance.

Reports surfaced over the weekend that Osbourne was diagnosed with epilepsy, but her tweets reveal that doctors still aren't sure about the source of her episode. "Thank U all 4 UR beautiful well wishes yes I did have a seizure they are just trying to figure out why?" she tweeted, along with a photo of an IV in her tattooed arm.

Osbourne remained in Cedars Sinai for observation and tests through Sunday.

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Photo/Video credit: Getty Images/Twitter