Katherine Jenkins apologises to fans over cancelled gig
"... A hospital visit last night has made a big difference and I feel I am coming out the other side of it. I hate letting you all down."
The affected event was iTunes Live From London, which will be rescheduled. Her official website has this message for her fans: "Details of the new date will be sent shortly.
"If you had received confirmation that you'd won access to the performance, you will still be on the list to see Katherine perform when the new date has been confirmed.
"Katherine thanks all her fans for their patience and understanding, and looks forward to seeing them in the New Year."