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The singer "has been released and is doing fine," the rep says.
Simpson, 27, went to Cedars-Sinai Medical Center on Friday after suffering a fever.
Earlier this month, Simpson took a trip to Iraq where she performed for the troops. She is currently working on a country album.
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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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