With Cher set to make her return to the Vegas stage, some are speculating the mystery illness that sidelined her was foodborne.

Cher was forced to cancel appearances in Dec. 2007 and checked into a German clinic for treatment. She was subsequently diagnosed with diverticulitis, an inflammation of pockets in the intestines.

Cher begins her run of performances in May, three years after her farewell tour.

Who is she, The Who?