The showbiz legend has spent her whole life in the spotlight. As she turns 80, her friends and collaborators share their stories from Hollywood singalongs to acid house raves

I first met Liza in 1963 when I was playing Eddie in a movie called The Courtship of Eddie’s Father. I was seven years old and I got this choice role, which was directed by the great Vincent Minnelli. There were no other kids on this movie, so I had a welfare worker who was also the studio teacher, and I was alone in my little second-grade classroom. But one day, Vincent introduced me to his daughter, who he said was just going to hang around.