Cher sick as mystery ailment strikes Diva Queen.

Superstar Cher, 62, canceled six shows in Vegas in less than a month due to a health mystery called Vegas Throat.

According to Caesar's Palace in Las Vegas, Cher was felled by asthma related bronchitis when she deep sixed her two final shows in Sin City.

But Cher's flack, Liz Rosenberg, claims the thrush is suffering from Vegas Throat a condition caused by the dry, humid-less air at the gambling capitol.

Yet insiders noted that Caesars spent millions installing a special humidifier especially built for Celine Dion's long running show to protect the songbird's delicate throat.

Speculation is rife that Cher's cancellation is due to her recent split from bad boy-toy BF Hell's Angel, Tim Medvetz, 38.

If so, what's Janet Jackson's problem?