Olivia Newton-John is gearing up to celebrate her 73rd birthday next month and has announced the special way she is marking it.MORE: Olivia Newton-John comforted by fans as she shares heartbreaking newsTaking to her official Facebook page, the Grease star shared a rare video to announce to her 1.2 million fans how exactly she would be spending the day – and why she needed their help.WATCH: Olivia's message to her fans ahead of her birthday"I want to invite you to my virtual event, Olivia's Walk for Wellness, on Sunday the 26th of September, which happens to be my birthday, to help raise funds for people with cancer to thrive," she excitedly revealed in the 54-second clip.READ: Olivia Newton-John's flamboyant California home is a world of.
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