Doctors are still trying to determine what caused Kelly Osbourne to have a seizure while filming E!'s Fashion Police yesterday.

Kelly tweeted the shot above and wrote, "Thank U all 4 UR beautiful well wishes yes I did have a seizure they are just trying to figure out why?"

Kelly's rep added in a statement, "Kelly fainted on the set of E!'s Fashion Police today. She was taken to a local hospital for further testing and is awake, alert and in stable condition. She will be staying overnight for observation as a precautionary measure."

Kelly fell to the floor at the end of the one-hour taping, and according to reports, she told Melissa Rivers that she wasn't feeling well before her collapse. The seizure lasted for approximately 30 seconds, and Kelly was then taken away on a stretcher.

Get better!