Home Australian singer and actress Olivia Newton-John and American actor John Travolta as they appear in the Paramount film ‘Grease’, 1978. <P><P> CREDIT: Paramount Pictures/Fotos International/Getty Images</P> Australian singer and actress Olivia Newton-John and American actor John Travolta as they appear in the Paramount film 'Grease', 1978. <P><P> CREDIT: Paramount Pictures/Fotos International/Getty Images</P>

Australian singer and actress Olivia Newton-John and American actor John Travolta as they appear in the Paramount film ‘Grease’, 1978.

CREDIT: Paramount Pictures/Fotos International/Getty Images

Australian singer and actress Olivia Newton-John and American actor John Travolta as they appear in the Paramount film ‘Grease’, 1978. (Photo by Paramount Pictures/Fotos International/Getty Images)

MELBOURNE, AUSTRALIA – SEPTEMBER 16: Olivia Newton-John during the annual Wellness Walk and Research Runon September 16, 2018 in Melbourne, Australia. The annual event, now in it’s sixth year, raises vital funds to support cancer research and wellness programs at the Olivia Newton-John Cancer Wellness and Research Centre in Victoria. <P><P> CREDIT: Scott Barbour/Getty Images</P>