Nor, indeed, would such distinguished figures as Claudia Cardinale, Robert Wagner, Gina Lollobrigida, Donny Osmond, Phyllis Diller, Jill St John, Petula Clark, former EastEnder Martine McCutcheon, Dudley Moore - attending despite being seriously ill with progressive supranuclear palsy - and the Doobie Brothers. But at 55, and after a long career in showbiz, Minnelli has learned to err on the side of caution.