/ Source: E!online
Well, we already know Ozzy Osbourne has a supersized case of Bieber fever.
But we're assuming that's not what caused the heavy metal legend to cancel his concert in Reno, Nev., on Sunday night.
All that a promoter for the singer's Scream tour has said so far, though, is that the 62-year-old Osbourne couldn't perform due to "a sudden illness."
The concert has subsequently been rescheduled for April.