Kelly's representative said he is undergoing medical treatment in his hometown of Chicago.
"Initial indications are that he is suffering from complications from surgery he had last year to treat an abscess on his vocal cords," a statement said. "As a result, Kelly has had to cancel appearances on 'The Jimmy Fallon Show' and NBC's 'Today' as well as a book party that was being held in his honor. It is unclear how long Kelly may be sidelined."
Celebrity Families of 2014 [PHOTOS]