Just a few hours before Justin ended up in a hospital bed, Kelly Osbourne also had a scary moment that sent her to one — she had a seizure while filming an episode of E”s Fashion Police.

Kelly was sitting in a chair, shooting the show in front of a full studio audience.  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.  Melissa then turned Kelly’s head to help her.  Someone from the audience — some kind of emergency responder — then ran up and helped.

Kelly came around a few moments later, but her handlers wanted to have her hospitalized anyway. We’re told it’s the first time Kelly has ever suffered a seizure.