Jessica Simpson is in the hospital

In Touch reports that Jessica has a minor kidney infection and is currently receiving treatment Cedars-Sinai Medical Center. She's been in there since Friday.

A friend said she's doing fine and she should be out by tomorrow. Her boyfriend, Tony Romo, couldn't be with her, because he had stuff to do in Dallas.

The friend went on to say, “She checked in on Friday morning because she was feeling achy and had a fever."