The reality star doesn't know what caused her illness

Kelly Osbourne has thanked her Twitter followers for their support after she had a seizure on the set of American show Fashion Police yesterday.

The reality star was taken to hospital – where she was expected to stay last night – following her collapse and this morning shared a photo of her IV drip with fans.

‘Thank U all 4 UR beautiful well wishes yes I did have a seizure they are just trying to figure out why?’ Tweeted Kelly, 28.

Kelly had been recording the latest episode of Fashion Police – on which she comments about other stars’ outfits – with fellow panellists Joan and Melissa Rivers when she complained of feeling ill.

Ozzy and Sharon‘s daughter reportedly fell out of her chair shaking.

Although she came round shortly after, her team advised her to get checked over by doctors.

Kelly Osbourne fainted on the set of E!‘s Fashion Police today,’ a spokeswoman told the Mail Online yesterday.

‘She was taken to hospital for further testing and is awake, alert and in stable condition.’

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Anna Duff