Photo: Getty Images
1 of 41 Pat Carroll and Olivia Newton-John, aka Pat and Olivia, on the River Thames in London, UK, 1st June 1966.Photo: Getty Images
2 of 41 Musical group 'Toomorrow' at an airport, UK, 31st July 1970; (L-R) Benny Thomas, Olivia Newton-John, Karl Chambers, Vic Cooper. TPhoto: Getty Images
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5 of 41 Olivia Newton-John performs on 'Top of The Pops' in 1970.Photo: Getty Images
6 of 41 Olivia Newton John performing in 1970.Photo: Getty Images
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8 of 41 July 1977: American actor John Travolta smiles as he poses with Australian singer and actor Olivia Newton-John at a party for director Randal Kleiser's film, 'Grease,' in which they both starred, California. Photo: Getty Images
9 of 41 Actress and singer Olivia Newton-John in May 1977.Photo: Getty Images
10 of 41 At the 'Grease' premiere in 1970. Photo: Getty Images
11 of 41 With American actor John Travolta as they appear in the Paramount film 'Grease', 1978.Photo: Getty Images
12 of 41 Singers Olivia Newton-John and Glen Campbell (1936 - 2017) with their awards at the American Music Awards in 1976. Newton-John won two awards for Best Pop/Rock Album ('Have You Never Been Mellow') and Favorite Pop/Rock Female Artist.Photo: Getty Images
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14 of 41 Posing with policemen in Brighton, where she rehearsed for the 'Eurovision' Song Contest in 1974.Photo: Getty Images
15 of 41 1975: (L-R) Connie Stevens, Olivia Newton-John, Ray Stevens at the American Music Awards. Photo: Getty Images
16 of 41 Olivia Newton-John visits Atlanta Braves pitcher Phil Niekro in 1982.Photo: Getty Images
17 of 41 In her music video for "Physical". Photo: Getty Images
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19 of 41 During an interview with host Johnny Carson on March 14, 1975.Photo: Getty Images
20 of 41 Princess Diana talking to (L to R) Kylie Minogue, Olivia Newton John at the Entertainment center in 1988.Photo: Getty Images
21 of 41 Rehearsal for the NSW Royal Bi Centennial Concert in 1988.Photo: Getty Images
22 of 41 (L-R) Musicians Cliff Richard, Olivia Newton-John, Andy Gibb and Elton John perform on the "Hollywood Nights" TV special in March 1980.Photo: Getty Images
23 of 41 Olivia Newton-John & Patty Loveless during The 32nd Annual Academy of Country Music Awards.Photo: Getty Images
24 of 41 Olivia Newton John and daughter Chloe Lattanzi during 2nd Annual "Eyes on the Environment - 25 Woman Leaders in Actions" at UN Secretariat Lounge in New York City.Photo: Getty Images
25 of 41 Kenny Ortega and Olivia Newton John during "Xanadu" Wrap Party in 1980.Photo: Getty Images
26 of 41 At the 2000 Olympics with tennis star, Patrick Rafter.Photo: Getty Images
27 of 41 Olivia Newton-John at her home in Malibu, California in 2002.Photo: Getty Images
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29 of 41 Attending the National Tree Day 10th Anniversary Launch at Sydney Park in 2005.Photo: Getty Images
30 of 41 Olivia speaks onstage during the 2013 G'Day USA Los Angeles Black Tie Gala in 2013.Photo: Getty Images
31 of 41 Olivia in 2005.Photo: Getty Images
32 of 41 Keith Urban and Olivia Newton-John during The 39th Annual CMA Awards.Photo: Getty Images
33 of 41 Olivia is greeted by Las Vegas entertainers from the shows 'Jubilee' and 'Chippendales' during her welcome event to celebrate her Vegas residency in 2014.Photo: Getty Images
34 of 41 Olivia Newton-John and John EasterlingPhoto: Getty Images
35 of 41 Actor John Travolta and actress Olivia Newton-John attend the Qantas Airways Spirit of Australia Party in 2012.Photo: Getty Images
36 of 41 With John Travolta at the 'Grease' 40th anniversary screening in 2018.Photo: Getty Images
37 of 41 Chloe Lattanzi, John Easterling and Olivia in 2019.Photo: Getty Images
38 of 41 Daughter Chloe Lattanzi and Olivia Newton John attends the Olivia Newton-John Wellness Walk and Research Run in 2019 in Melbourne, Australia. Photo: Getty Images
39 of 41 Supporting the Cancer & Wellness Centre by leading the way on this charitable walk in 2014.Photo: Getty Images
40 of 41 Olivia appears on 'Watch What Happens Live with Andy Cohen.'Photo: Getty Images
41 of 41 Olivia Newton-John performs during Fire Fight Australia on February 16, 2020.Photo: Getty Images