- 4 updates
Kelly Osbourne has tweeted to say doctors are "trying to figure out" why the star had her seizure.
Tweeting an image of her arm, from what looks like a hospital bed, she said:
"Thank U all 4 UR beautiful well wishes yes I did have a seizure they are just trying to figure out why?"
Comedian Joan Rivers, who was present when Kelly Osbourne reportedly had a seizure, told celebrity website TMZ that the daughter of Ozzy and Sharon "is fine."
Kelly Osbourne was filming her television show Fashion Police in front of a full studio audience when she turned to Melissa Rivers - daughter of comedian Joan - and said "I don't feel good", according to celebrity website TMZ.
The daughter of Sharon and Ozzy then reportedly fell out of her chair before the seizure begun.
An audience member, believed to be an emergency responder, ran up to help Ms Osbourne.
Entertainment Tonight is reporting that Kelly Osbourne has suffered a seizure while filming her TV show, Fashion Police, in LA.
She has been taken to a hospital nearby.