Kelly Osbourne was rushed to an L.A. hospital just before noon on Thursday, March 7, after suffering a seizure while filming her E! show, Fashion Police, multiple outlets are reporting. According to ET Online, the 28-year-old star was taken from the scene on a stretcher.

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TMZ reports that Osbourne was sitting in her chair when she turned to Melissa Rivers and said, "I don't feel good." She then fell out of the chair and started shaking. The seizure lasted for about 30 seconds, ET Online reports, during which time Rivers and other crew members rushed to her side. An EMT, who just happened to be in the audience, also ran to the stage to help.

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Osbourne woke a short while later, but was taken to a hospital by ambulance to be evaluated. Fashion Police co-host Joan Rivers, who was present on set during the incident, told TMZ that her costar "is fine." And a source tells Us Weekly that Osbourne is "speaking with doctors and under evaluation. Her condition is stable."

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It's not yet known what led to the frightening episode. Osbourne's rep could not be reached for comment.

This article originally appeared on Kelly Osbourne Has Seizure, Is Rushed to Hospital in an Ambulance