Kerr was born William Henry Kerr in Cape Town, South Africa, on 10 June 1922 to an Australian performing arts family, growing up in Wagga Wagga, New South Wales, Australia. His career in show Business began when he was very young. Wilton, his son, recalled: "His mum used him instead of using a prop, a baby prop, she actually used her son, her newborn son, so he was literally kind of born to do it."