'Real Housewives' Star Hospitalized

TMZ has learned ... Vicki Gunvalson -- star of "The Real Housewives of Orange County" -- has been hospitalized.

Vicki Gunvalson hospitalized.
We do not know the nature of her condition.

TMZ broke the story ... Gunvalson filed for divorce last week.

UPDATE: Sources tell TMZ Gunvalson is suffering from internal bleeding.  She's being kept overnight for observation for upper G.I. problems.

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