Gayle King has revealed the whispered bathroom calls she had with Oprah in a heartfelt tribute to Olivia Newton-John.EXCLUSIVE: Remembering Olivia Newton-John - Her family, Dolly Parton, Sir Cliff and more share memoriesThe TV presenter made the sweet revelation when she was celebrating the memory of the Grease actress in HELLO!'s special Breast Cancer Awareness Month digital issue. "I'm in the bathroom whispering to Oprah," she told us.Speaking fondly of the memory, Gayle remembered when she called Oprah to ask if she could invite Olivia over for dinner to her house after interviewing her for CBS Sunday Morning.She had wanted to keep the fun going after spending the day at Olivia's California ranch for the TV interview.