John Travolta says Olivia Newton-John is doing 'fine' amid cancer battle (Exclusive)

John Travolta is giving a health update on his Grease co-star, Olivia Newton-John.

ET caught up with the actor at the 2019 G'Day USA Los Angeles Gala to Honor Australians, where he briefly spoke about his friend's battle with cancer.

"From what I hear talking to her she's fine," Travolta told ET's Keltie Knight. "I think she even made a public announcement in her own video, [saying] that she was fine."

Earlier this month, Newton-John slammed false reports for exaggerating her illness and alleging she's on the brink of death in a video posted to her Facebook page.

"Happy New Year, everyone! This is Olivia Newton-John, and I just want to say that the rumors of my death have been greatly exaggerated, to quote the famous quote [atributed to Mark Twain]," the 70-year-old actress said at the time. "I'm doing great and I want to wish all of you the happiest, healthiest 2019 that is possible."

"Thank you all for your wonderful love and support, for me and for my Olivia Newton-John Cancer Wellness Center in Melbourne, Australia," she added. "Thank you so much!"

Newton-John revealed back in September during the Australian news program Sunday Night that she's battling cancer for a third time and in recovery again. "I'm one of millions in this fight, in this journey," she said. "A lot of people see it as a fight and wherever you choose to see it, that’s your prerogative. ... I see it as part of my mission, maybe."

"There are other people out there doing much, much worse than me," she continued. "And I'm a very privileged person and I'm very aware of that. I have nothing to really complain about."

Newton-John was first diagnosed with breast cancer in 1992. She beat the disease after months of chemotherapy treatments and a partial mastectomy but revealed in May 2017 that the breast cancer had returned, spreading to her shoulder.

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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