Sick star Marie Osmond realised she needed hospital treatment after she failed to hit the high notes during her show in Las Vegas.
The singer appeared in her Donny & Marie variety performance on Wednesday night (26Oct11) and was admitted to a medical centre in the city after stepping off stage.
Doctors diagnosed her with bronchitis and sent her home, and Osmond has now revealed she thought the illness was down to her allergies until she struggled to sing on stage.
In a post on her Twitter.com page, she writes, "So the allergies went into a bronchitis. Didn't realise it until I went to hit the high notes... on stage."