UPDATE: Kelly stayed in the hospital overnight, and shared a status update.

Previous story:

Kelly Osbourne was rushed to a Los Angeles-area hospital after suffering a seizure while filming the E! show Fashion Police.

According to Entertainment Tonight, Kelly's seizure lasted for around 30 second and caused her to fall to the floor. Several people rushed over to help, including reportedly an EMT who happened to be in the audience. "She awoke on the floor," ET reports, "and was shielded by blankets on her way out of the studio to be taken by ambulance to the hospital."

What happened? According to TMZ, Kelly was sitting in her chair, shooting the show with Melissa Rivers, when she turned to Melissa and said, "I don't feel good." Then she reportedly fell out of her chair and started shaking. She came around but her handlers wanted her to go to the hospital. 

This is supposedly the first time Kelly has ever suffered a seizure. Joan Rivers was also there and told TMZ of Kelly, "She is fine. We just saw her."

Source: Entertainment TonightTMZ