Marie Osmond made a beeline for the ER last night after her Vegas show -- and was diagnosed with a bad case of bronchitis ... TMZ has learned.
Osmond's rep Alan Nierob tells TMZ ... Marie has a "bad lung problem" and was released from the hospital after a couple of hours. She is currently seeing doctors.
It's unclear whether her condition will affect her Las Vegas show, but a box office rep at the Flamingo -- where Marie performs -- tells us, Marie is still scheduled to appear tonight.
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