"Thank you to all the Doctors Nurses Medical Staff & Employees @CedarsSinai Hospital for fixing me enough to go home its so nice to bein bed!" Osbourne, 28, wrote on Twitter after her release.
Osbourne fainted on the set of the E! show on Thursday. It was later determined that she had a seizure.
But her rep tells E! News that she was given "a clean bill of health" upon her release.
"Doctors ran numerous tests and determined that this was most likely a onetime episode of which there are no conclusive results," the rep said. "She is looking forward to returning to Fashion Police this week and getting back to business and life as usual."
While in the hospital, Osbourne joked that the situation was dire. "My life is now like an episode of House," she posted on Twitter. "The impending fight against death and the look of fear in everyones faces!"
Thank you to all the Doctors Nurses Medical Staff & Employees @cedarssinai Hospital for fixing me enough to go home its so nice to bein bed!— Kelly Osbourne (@MissKellyO) March 12, 2013