Donny Osmond News: Update: Donny Osmond on Marie's Show-Stopping Illness

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Donny Osmond speaks to ET about what caused his sister Marie to become so ill that the duo had to cancel their Las Vegas show on Friday night.

Donny reveals that Marie got sick with iodine poisoning after she stopped at a sushi restaurant on the way to the show and ate something containing peanuts and shrimp -- both of which she is highly allergic to.

Donny tells ET he rushed to be with his sister when he learned Marie was ill. When he arrived, a doctor was already on the scene and Marie was lying on the floor surrounded by people. He...