After just three days behind bars,

Paris Hilton has been sent home from jail with a "medical condition."

The hotel heiress formerly known as inmate 9818783 made an early exit from the Century Regional Detention Facility shortly after midnight Thursday after serving just three full days of the 45 days to which she was originally sentenced.

At a news conference Thursday morning, Los Angeles Sheriff's Department spokesman Steve Whitmore said Hilton had been diagnosed with "medical issues" that resulted in her being "reassigned" to house arrest for the next 40 days.

He said he was prohibited by law from going into specifics about said "medical issues."