Osbourne, the daughter of rocker Ozzy and Sharon, was shooting in front of a studio audience when she told guest-co-host Melissa Rivers that she didn't feel well. Right after, she fell out of her chair and started shaking. After Osbourne came to, she was transported to a local Los Angeles hospital.
There's no word on her current condition, but TMZ ran into Fashion Police co-host Joan Rivers after the incident. "She is fine," Rivers said. "We just saw her."