Olivia Newton-John gave her friend and country singer Kelly Lang the strength to "continue on".EXCLUSIVE: Remembering Olivia Newton-John - Her family, Dolly Parton, Sir Cliff and more share memoriesIntroduced through their mutual friend Sir Barry Gibb – they both had an instant bond as mothers, singers, writers and a shared connection to breast cancer that Olivia called thrivers. Kelly, a 17-year breast cancer thriver, had to put a "brave face" on when she was diagnosed with breast cancer at 36, with two young girls to look after.Now in our Breast Cancer Awareness Month special, the musician has lovingly talked about how her friend Olivia inspired her with her "big heart" and was like a "big sister" to her.She told HELLO!: "Having been a breast cancer patient myself, she gave me the strength to continue on.