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The actress entered the emergency room of a New York hospital on Monday.
"Mary Kate got a kidney infection," says rep Nicole Caruso. "She's resting comfortably and will be released in the next day or so."
The actress, who turned 21 in June, recently said she was in good health.
"Mentally, physically, I feel pretty on top of my game right now," she told EW.com in September, as she prepared for her debut in Showtime's Weeds. "Talk to me next week, I don't know. Today, I feel good."
JOSH & FERGIE: ROCKED BY SCANDAL
Did he cheat with a stripper?
Married less than a year, the couple denies an Atlanta woman’s claims that she and Josh had a fling
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