An illness took Jessica Simpson's breath away, temporarily derailing her summer concert tour. Three hours before a scheduled concert in Providence, R.I., on Tuesday, Simpson called in sick, citing a kidney infection, a Columbia Records publicist told reporters. After being treated at and released from a local hospital, the 23-year-old ''Newlyweds'' star was expected to be well enough to perform on Wednesday as scheduled in Manchester, N.H., the Boston Globe reported. In a statement, Simpson said: ''I'm having the best time doing this tour and I'm so disappointed that I have to miss tonight's show. I appreciate everyone's get-well wishes and, as soon as my doctor says it's okay, I'll be back on stage, doing what I love. I hope to see my fans in Rhode Island soon.'' Providence ticketholders were told that their tickets would be honored at a make-up concert that is yet to be scheduled.