Olivia Newton-John is determined to enjoy her life as she battles stage 4 cancer

Olivia Newton-John is choosing to live life to the fullest as she once again battles cancer.

The singer and actress recently revealed that her cancer has come back for a third time, and is more aggressive than ever, but she's not letting the challenges of living with stage 4 cancer break her optimistic spirit.

"I'm so lucky that I've been through this three times and I'm still here," Newton-John told 60 Minutes in a sit-down interview on Sunday.

While the battle is hard, the Grease star said she's trying to keep a bright outlook on her situation, and not let it spoil the time she has left, which she plans to enjoy.

"We know we're gonna die at some point, and we don't know when it is, when you're given a cancer diagnosis or a scary honest diagnosis, you're suddenly given a possibility of a time limit," Newton-John shared. "So every day is a gift."

28 PHOTOS
Olivia Newton-John and husband John Easterling together
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Olivia Newton-John and husband John Easterling together
NASHVILLE, TN - NOVEMBER 02: John Easterling (L) and singer Olivia Newton-John (R) attend the 50th annual CMA Awards at the Bridgestone Arena on November 2, 2016 in Nashville, Tennessee. (Photo by John Shearer/WireImage)
MELBOURNE, AUSTRALIA - SEPTEMBER 17: John Easterling and Olivia Newton-John arrive ahead of the Olivia Newton-John Gala at Crown Palladium on September 17, 2016 in Melbourne, Australia. (Photo by Sam Tabone/WireImage)
LOS ANGELES, CA - MAY 21: John Easterling (R) and Olivia Newton-John arrive for the Steve Irwin Gala Dinner at JW Marriott Los Angeles at L.A. LIVE on May 21, 2016 in Los Angeles, California. (Photo by Gabriel Olsen/FilmMagic)
LOS ANGELES, CA - MAY 21: (L-R) John Easterling, Robert Irwin, naturalist Terri Irwin, TV personality Bindi Irwin and singer Olivia Newton-John attend the Steve Irwin Gala Dinner at JW Marriott Los Angeles at L.A. LIVE on May 21, 2016 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CALIFORNIA - APRIL 01: (L-R) John Easterling, singer Chloe Lattanzi, James Driskill and singer Olivia Newton-John attend the premiere of Syfy's 'Dead 7' at Harmony Gold on April 1, 2016 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LAS VEGAS, NV - JANUARY 23: Entertainer Olivia Newton-John (R) and her husband, John Easterling, attend Nevada Ballet Theatre's 32nd annual Black & White Ball honoring her at Wynn Las Vegas on January 23, 2016 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - AUGUST 09: Husband John Easterling and singer/actress Olivia Newton-John celebrate the 35th anniversary of 'Xanadu' with the world premiere of their music video 'You Have to Believe' at Share Nightclub on August 9, 2015 in Las Vegas, Nevada. (Photo by Steven Lawton/FilmMagic)
LOS ANGELES, CA - OCTOBER 29: John Easterling and Olivia Newton-John attend at Healthy Child Healthy World 'Mom On A Mission GALA' 2014 on October 29, 2014 in Los Angeles, California. (Photo by Michael Bezjian/WireImage)
WEST HOLLYWOOD, CA - OCTOBER 29: Singer Olivia Newton-John (R) and husband John Easterling attend the Mom On A Mission 6th Annual Awards & Gala at the London Hotel on October 29, 2014 in West Hollywood, California. (Photo by David Livingston/Getty Images)
MELBOURNE, AUSTRALIA - SEPTEMBER 28: Olivia Newton-John and husband John Easterling plant a commemorative survivor/remembrance pinwheel supporting the Cancer & Wellness Centre after leading the way on this charitable walk at The Centre Ivanhoe on September 28, 2014 in Melbourne, Australia. The walk aims to raise funds for the wellness and supportive care programs provided to patients. (Photo by Robert Prezioso/Getty Images)
MELBOURNE, AUSTRALIA - SEPTEMBER 28: Olivia Newton-John and husband John Easterling supports the Cancer & Wellness Centre by leading the way on this charitable walk at The Centre Ivanhoe on September 28, 2014 in Melbourne, Australia. The walk aims to raise funds for the wellness and supportive care programs provided to patients. (Photo by Robert Prezioso/Getty Images)
LAS VEGAS, NV - APRIL 11: John Easterling, Olivia Newton-John, Pat Farrar and John Farrar attend the after party of Olivia Newton-John's new show 'Summer Nights' at Flamingo Las Vegas on April 11, 2014 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NEVADA - DECEMBER 10: Singer/actress Olivia Newton-John and John Easterling arrive at the American Country Awards 2013 at the Mandalay Bay Events Center on December 10, 2013 in Las Vegas, Nevada. (Photo by Axelle/Bauer-Griffin/FilmMagic)
MELBOURNE, AUSTRALIA - SEPTEMBER 20: Olivia Newton-John and her husband John Easterling kiss as they arrive at the inaugural ONJ Gala to raise funds for the Olivia Newton-John Cancer & Wellness Centre at the Regent Plaza Ballroom on September 20, 2013 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)
LOS ANGELES, CA - JANUARY 12: Actress Olivia Newton-John and John Easterling arrive for the G'Day USA Black Tie Gala held at at the JW Marriot at LA Live on January 12, 2013 in Los Angeles, California. (Photo by Mark Sullivan/Getty Images)
MELBOURNE, AUSTRALIA - SEPTEMBER 15: Australian actress, Olivia Newton-John and her husband, John Easterling prepare to lead the inaugural Wellness Walk on September 15, 2013 in Melbourne, Australia. The event will raise funds for the Olivia Newton-John Cancer and Wellness Centre. (Photo by Scott Barbour/Getty Images)
INDIANAPOLIS, IN - MAY 26: Olivia Newton-John (R) and her husband John Easterling attends the IPL 500 Festival Parade at on May 26, 2012 in Indianapolis, Indiana. (Photo by Joey Foley/Getty Images)
ROME, ITALY - OCTOBER 28: John Easterling and Olivia Newton-John attend 'A Few Best Men' Premiere during the 6th International Rome Film Festival at Auditorium Parco Della Musica on October 28, 2011 in Rome, Italy. (Photo by Venturelli/WireImage)
LOS ANGELES, CA - OCTOBER 24: John Easterling and Olivia Newton-John attend the Australians in Film screening of 'A Few Best Men' held at the Academy of Motion Picture Arts and Sciences Pickford Centre on October 24, 2011 in Los Angeles, California. (Photo by Toby Canham/Getty Images)
NEW YORK, NY - APRIL 27: Olivia Newton-John and husband John Easterling pose as she promotes 'Livwise' at Barnes & Noble 18th Street on April 27, 2012 in New York City. (Photo by Bruce Glikas/FilmMagic)
BURBANK, CA - OCTOBER 06: Actress Olivia Newton-John and husband John Easterling attend the '1 A Minute' LIVE Supporting Susan G. Komen for the Cure' premiere at Woodbury University on October 6, 2010 in Burbank, California. (Photo by Angela Weiss/Getty Images)
WASHINGTON - OCTOBER 16: John Easterling and Olivia Newton-John attend Honoring The Promise celebrates the 30th anniversary of the Promise at The John F. Kennedy Center for Performing Arts on October 16, 2010 in Washington, DC. (Photo by Paul Morigi/WireImage)
HOLLYWOOD, CA - JANUARY 22: John Easterling, Actors, Olivia Newton-John, John Travolta and Kelly Preston arrive at the G'Day USA Australia Week 2011 Black Tie Gala at Hollywood Palladium on January 22, 2011 in Hollywood, California. (Photo by Jeffrey Mayer/WireImage)
TORONTO, ON - SEPTEMBER 09: John Easterling and singer/actress Olivia Newton-John attend the Opening Night Party during the 35th Toronto International Film Festival at Spice Route on September 9, 2010 in Toronto, Canada. (Photo by George Pimentel/Getty Images)
MELBOURNE, AUSTRALIA - MAY 21: Olivia Newton-John and husband John Easterling arrive at the 2010 Precious Metal Ball in support of the Olivia Newton-John Cancer and Wellness Centre at Peninsula, the Docklands on May 21, 2010 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)
HOLLYWOOD, CA - JANUARY 16: Amazon John Easterling and Olivia Newton-John arrive at G'Day USA 2010 Los Angeles Black Tie Gala held at Hollywood & Highland on January 16, 2010 in Hollywood, California. (Photo by Gregg DeGuire/FilmMagic)
DUESSELDORF, GERMANY - OCTOBER 06: Olivia Newton-John and husband John Easterling arrive at the Airport on October 6, 2009 in Duesseldorf, Germany. Newton-John arrives in Germany to participate in a breast cancer prevention month. (Photo by Friedemann Vogel/Getty Images)
NEW YORK - APRIL 02: Olivia Newton-John (R) and husband John Easterling (L) visit FOX's 'The Morning Show with Mike and Juliet' at FOX studios on April 2, 2009 in New York City. (Photo by Bruce Glikas/FilmMagic)
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To this end, the 70-year-old four-time GRAMMY winner said she has no interest in hearing estimates about her remaining life expectancy, and she has no idea how long doctors expect her to live.

"If somebody tells you, you have six months to live, very possibly you will because you believe that," Newton-John shared. "So for me, psychologically, it's better not to have any idea of what they expect or what the last person that has what you have lived, so I don't, I don't tune in."

In March, ET's Nancy O'Dell sat down with the entertainer, who shared some inspirational words about her views on life, and her plans for the future.

"Every day is a gift, we don't really know how long our life is," she shared. "I'm very grateful, and I intend to be here for a long time. I have much to do still."

26 PHOTOS
John Travolta and Olivia Newton-John
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John Travolta and Olivia Newton-John
BEVERLY HILLS, CA - AUGUST 15: Olivia Newton-John and John Travolta attend the Academy Presents 'Grease' (1978) 40th Anniversary at the Samuel Goldwyn Theater on August 15, 2018 in Beverly Hills, California. (Photo by Alberto E. Rodriguez/Getty Images)
BEVERLY HILLS, CA - AUGUST 15: Olivia Newton-John and John Travolta attend The Academy Presents 'Grease' (1978) 40th Anniversary at Samuel Goldwyn Theater on August 15, 2018 in Beverly Hills, California. (Photo by Jon Kopaloff/FilmMagic)
BEVERLY HILLS, CA - AUGUST 15: Olivia Newton John;John Travolta arrives at the The Academy Presents 'Grease' (1978) 40th Anniversary at Samuel Goldwyn Theater on August 15, 2018 in Beverly Hills, California. (Photo by Steve Granitz/WireImage)
BEVERLY HILLS, CA - AUGUST 15: Olivia Newton-John, John Travolta arrives at the The Academy Presents 'Grease' (1978) 40th Anniversary at Samuel Goldwyn Theater on August 15, 2018 in Beverly Hills, California. (Photo by Steve Granitz/WireImage)
BEVERLY HILLS, CA - AUGUST 15: Olivia Newton-John and John Travolta attend The Academy Presents 'Grease' (1978) 40th Anniversary at Samuel Goldwyn Theater on August 15, 2018 in Beverly Hills, California. (Photo by Jon Kopaloff/FilmMagic)
Singer and actress Olivia Newton-John and co-star John Travolta attend the premiere of the film 'Grease', 1978. (Photo by Michael Ochs Archives/Getty Images)
HOLLYWOOD, CA - 1978: Singer and actress Olivia Newton-John and co-star John Travolta attend their 1978 Hollywood, California, premiere of 'Grease.' Produced by Alan Carr, 'Grease' was one of the hit films of 1978. (Photo by George Rose/Getty Images)
1977: Actors John Travolta and Olivia Newton-John stand at a bar at a party for the film, 'Grease,' in which they both starred. Travolta is wearing a suit and tie and Newton-John is wearing a black shirt and blue jeans and carries a quilted gold bag. (Photo by Max B. Miller/Fotos International/Getty Images)
Olivia Newton John and John Travolta during 2000th Performance of 'Grease' Celebration at Royale Theatre in New York City, NY, United States. (Photo by Ron Galella/WireImage)
WEST HOLLYWOOD, CA - APRIL 5: Singer/Actress Olivia Newton-John and actor John Travolta on April 5, 1978 dine at The Palm in West Hollywood, California. (Photo by Ron Galella/WireImage)
Olivia Newton John and John Travolta during 50th Annual Academy Awards at Dorothy Chandler Pavillion in Los Angeles, California, United States. (Photo by Ron Galella/WireImage)
Olivia Newton-John and John Travolta during 'Grease' 20th Annual Class Reunion at Sheraton Universal Hotel in Universal City, California, United States. (Photo by Ron Galella, Ltd./WireImage)
LOS ANGELES, CA - SEPTEMBER 24: Actress/Singer Olivia Newton-John and actor John Travolta from the movie 'Grease' attend the Celebration of Paramount Studio's 90th Anniversary with the release of six all-time musical favorites 'Grease', 'Saturday Night Fever', 'Flashdance', 'Footloose', 'Urban Cowboy' and 'Staying Alive' on September 22, 2002 at Paramount Studios in Los Angeles, California. (Photo by Jon Kopaloff/Getty Images)
John Travolta & Olivia Newton-John (Photo by Michael Caulfield/WireImage)
Olivia Newton-John and John Travolta (Photo by Gregg DeGuire/WireImage)
Olivia Newton-John and John Travolta during Paramount Home Entertainment Celebrates DVD Releases Of 6 All-Time Musical Favorites - Inside and Show at Paramount Studios in Hollywood, California, United States. (Photo by M. Caulfield/WireImage)
John Travolta and Olivia Newton-John perform during Paramount Home Entertainment Celebrates DVD Releases Of 6 All-Time Musical Favorites - Inside and Show at Paramount Studios in Hollywood, California, United States. (Photo by M. Caulfield/WireImage)
LOS ANGELES - JANUARY 14: (from left to right) Actress Kelly Preston, actor John Travolta and actress/singer Olivia Newton-John arrive at the Penfolds Icon Gala presented by G'Day La: Australia Week 2006 at the Palladium on January 14, 2006 in Los Angeles, California. (Photo by Michael Buckner/Getty Images)
John Travolta and Olivia Newton-John during Paramount Home Entertainment Celebrates DVD Releases Of 6 All-Time Musical Favorites - Inside and Show at Paramount Studios in Hollywood, California, United States. (Photo by M. Caulfield/WireImage)
LOS ANGELES, CA - JANUARY 19: Actor John Travolta and singer Olivia Newton-John arrive at the GDay USA Australia.com black tie gala held at the Grand Ballroom in the Hollywood & Highland Center on January 19, 2008 in Hollywood, California. (Photo by Barry King/WireImage)
John Travolta and Olivia Newton-John during G'Day LA: Australia Week 2006 - Penfolds Icon Gala Dinner - Arrivals in Los Angelees, California, United States. (Photo by Gregg DeGuire/WireImage)
HOLLYWOOD, CA - JANUARY 16: Olivia Newton-John and John Travolta arrive at G'Day USA 2010 Los Angeles Black Tie Gala held at Hollywood & Highland on January 16, 2010 in Hollywood, California. (Photo by Gregg DeGuire/FilmMagic)
GOOD MORNING AMERICA - John Travolta and Olivia Newton-John reunite on GOOD MORNING AMERICA, airing MONDAY, DEC. 17 (7-9am, ET) on the ABC Television Network. (Photo by Heidi Gutman/ABC via Getty Images) JOHN TRAVOLTA, OLIVIA NEWTON-JOHN
LIVE WITH KELLY AND MICHAEL -12/19/12 - John Travolta and Olivia Newton stop by Live, and sing a bit of ?Have Yourself a Merry Little Christmas? from their album, a cappella, on LIVE with Kelly and Michael,' distributed by Disney-ABC Domestic Television. (Photo by Lorenzo Bevilaqua/Disney-ABC via Getty Images) JOHN TRAVOLTA, OLIVIA NEWTON JOHN, KELLY RIPA, MICHAEL STRAHAN
LOS ANGELES, CA - JANUARY 12: (L-R) Honoree Paul Hogan, presenter Olivia Newton-John and honoree John Travolta attend the 2013 G'Day USA Los Angeles Black Tie Gala at JW Marriott Los Angeles at L.A. LIVE on January 12, 2013 in Los Angeles, California. (Photo by John Sciulli/Getty Images for G'Day Australia)
LOS ANGELES, CA - JANUARY 27: (L-R) Actor John Travolta and Honoree Olivia Newton John speak onstage during the 2018 G'Day USA Black Tie Gala at InterContinental Los Angeles Downtown on January 27, 2018 in Los Angeles, California. (Photo by John Sciulli/Getty Images for G'Day USA)
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Newton-John is also getting a lot of support from her family and some of her famous friends, including Hugh Jackman who recorded a special message of love for the actress during a stop in Sydney, Australia, on his The Man. The Music. The Show World Tour on Monday.

"High Olivia, it's Hugh, and 15,000 of your friends and fans," Jackman says into the camera as he pans around to show the cheering audience behind him at the Qudos Bank Arena. "You are the most amazing person, the most amazing mom, the most amazing ambassador. And we love you."

Jackman then led the audience in a massive cheer of "We love you" that resonated in the rafters of the arena.

While Newton-John is battling her ailment yet again that isn't keeping her from trying to do good and help others.

Newton-John has taken a break from performing as she focuses on her well-being, but she's also working to raise money for the Cancer Wellness & Research Center in Australia, to help others deal with the same challenges facing her. To this end, she's auctioning off some mementos from her career, including the famous skin-tight black pants she wore playing Sandy in Grease.

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