Nicole Richie has been hospitalized but is "doing well."
"Nicole has checked into Cedars-Sinai where she is being treated for pneumonia," her rep tells celebrity news agency X17. "She is doing well."
Last week the star's rep shot down Internet rumors that Richie, 28, was suffering from the swine flu.
On Sunday, she tweeted about battling illness, writing "ok cold, it's been 6 days. Lets part ways graciously & keep it moving."