Billy Joel is "totally healthy", Christie Brinkley's daughter has insisted.
The 75-year-old singer recently announced he was postponing his tour by several months for medical reasons but Sailor Brinkley-Cook - who is the offspring of the 'Uptown Girl' hitmaker's second wife and her now ex-husband Peter Cook - has reassured fans he is "doing great" and will be back on stage as soon as he can.