Lester Cohen, WireImage
Entertainment Tonight reports there is no word yet on Kelly's condition.
The Osbourne family's health has made headlines in recent years.
Last year, Sharon Osbourne underwent a double mastectomy in a preventive procedure and Jack Osbourne was diagnosed with multiple sclerosis.
Two weeks ago, Kelly tweeted that she sprained her ankle after falling in a bathroom.
Update (3/7/2013 4:03 p.m.): TMZ reports that Kelly was filming an episode of the show in front of a full audience. She turned to Melissa Rivers, who was filling in for Giuliana Rancic, and said "I don't feel good." She then fell out of the chair and began shaking. An emergency responder from the audience reportedly ran to help and Kelly came around moments later, although she was taken to a nearby hospital as a precaution.
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