Jay Leno out of the hospital

What was the mystery illness that sent Jay Leno to the hospital yesterday? Maybe it was a viral infection, according to this report, but the official cause hasn't been revealed. Sources have denied rumors that Leno, who turns 59 next week, had had a heart attack, was dehydrated (hey, it was pretty hot in L.A. earlier this week) or suffered food poisoning.

In any case, another rerun is in store for tonight, featuring Charles Barkley and Leslie Mann (it first aired a week ago). In addition, the comedian had to cancel a Vegas appearance at the Mirage. Leno, who was released from the Providence St. Joseph Medical Center today, will reportedly be back to work on Monday.