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Jessica Simpson has quickly checked in and out of the hospital after suffering a kidney infection.

In Touch magazine reports that Simpson arrived at the hospital on Friday. According to her rep, “[Simpson] was hospitalized for a kidney infection, but she has been released and is doing fine.”

A source also told the mag that “She checked in on Friday morning because she was feeling achy and had a fever. She is so happy she is out and feeling great.”

Simpson was treated at the Cedars-Sinai Medical Center.

Mary-Kate Olsen was hospitalized yesterday for an apparent kidney infection.

The tiny 21-year-old twin is now in good condition. “Mary-Kate got a kidney infection,” her rep, Nicole Caruso, told People. “She’s resting comfortably and will be released in the next day or so.”

This is not the first time Olsen’s health has been an issue. In 2004 she sought help for an eating disorder.

She has recently been romantically linked to hockey player Sean Avery.