As we reported earlier, Janet Jackson was hospitalized after falling "suddenly ill" before a concert in Montreal on Monday.  Thankfully, the singer has been released, however she has been forced to cancel to more stops on her "Rock Witchu Tour" while she recovers.

A spokeswoman for the McGill University Health Centre, where Jackson was treated said, "Yesterday evening she was checked into the Royal Victoria Hospital and left a couple of hours later."  

There has been no official word on her illness, but a source close to her boyfriend, Jermaine Dupri, has revealed that she was suffering from exhaustion because of the gruelling tour schedule.

The source told People magazine, "A 42-year-old body can't handle what a 22-year-old body can. I can tell you that she's definitely tired. It was probably exhaustion.  She is doing back-to-back, three-hour shows, and her body isn't the same as it used to be."

The same night that Jackson was rushed to the hospital, Dupri was spotted in New York City partying at Patron's Music in Motion Tour featuring TI at Marquee. "If [Janet's condition] was more serious he would've rushed to her side," added the source. 

Jackson, has postponed her Wednesday show in Boston and a Thursday performance in Philadelphia until further notice. She will resume her tour Saturday in Greensboro, N.C.