They report: Melissa Rivers was sitting next to her, filling in for Giuliana Rancic. Kelly turned to Melissa and said, "I don't feel good," and then she fell out of the chair and started shaking.

Rivers then turned Osbourne's head to help her. Someone from the audience -- reportedly some kind of emergency responder -- then ran up and helped.

Kelly came around a few moments later, but her handlers wanted to have her evaluated at hospitalized since she has no history of seizures.

AceShowbiz reports that Osbourne's representative said, "She's speaking with doctors and is under evaluation. Her condition is stable."