John Travolta praises Olivia Newton-John amid cancer battle: 'I'm very proud of her' (Exclusive)

John Travolta is sharing some super sweet words for his longtime friend Olivia Newton-John amid her ongoing public battle with stage 4 cancer.

The celebrated star walked the red carpet at the premiere of his new film, The Fanatic, at the Egyptian Theatre in Hollywood on Thursday, and he stopped to talk with ET where he had nothing but praise for his beloved Grease co-star.

"She looks incredible," Travolta, 65, marveled. "She doesn't look any different than [she did] years ago, and I'm very proud of her."

"I'm very happy about Olivia," the actor added with a smile.

Newton-John, 70, sat down with 60 Minutes Australia, in an emotional interview that aired earlier this month, where she opened up about her latest battle with cancer and explained that she's working hard to enjoy life to the fullest.

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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ET spoke with Newton-John last week, and the actress shared, "I just want everyone to know, I'm here, I'm doing great. I'm doing really well and I'm really healthy."

Travolta and Newton-John have long been close friends and fans of one another -- but in Travolta's new film, The Fanatic, the actor shows a different, darker side of fandom.

In the movie, Travolta plays a man named Moose who is obsessed with an actor and increasingly begins to encroach on the star's space. The role required something of a radical transformation that included a bizarre, bowl-cut hairstyle and a truly strange overall look.

"I found on the internet this guy that had that haircut and rimless glasses and I superimposed it on a photograph [of me] and I sent it to [director] Fred Durst, and he fell in love with the look," Travolta explained. "Then we added the Hawaiian shirt and the shorts and it just came together, [as] kismet, you know?"

Travolta said that, when it comes to dedicated fans, he's had some good experiences and he even knows exactly who his biggest fan really is.

"My number one fan in the world is Sharon Travolta," the actor said, referring to a devoted admirer who lives in England and who's been a follower of the actor's work for decades. "She changed her name to my name out of love 40 years ago and on her birthday she watches every movie [of mine] 24/7, and that's kind of her gift to herself and me on her birthday."

The actors' die-hard devotee will soon have another movie to add to her list with The Fanatic, which hits theaters Aug. 30.

18 PHOTOS
John Travolta and Kelly Preston in recent years
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John Travolta and Kelly Preston in recent years
NEW YORK, NY - JUNE 14: Kelly Preston and John Travolta attend the New York premiere of Gotti starring John Travolta, in theaters June 15, 2018 on June 14, 2018. (Photo by Dave Kotinsky/Getty Images for The 'Gotti' Film)
NEW YORK, NY - JUNE 14: Actors Kelly Preston and John Travolta attend the 'Gotti' New York premiere at SVA Theater on June 14, 2018 in New York City. (Photo by Jim Spellman/WireImage)
NEW YORK, NY - JUNE 14: Actors John Travolta and Kelly Preston attend the 'Gotti' New York premiere at SVA Theater on June 14, 2018 in New York City. (Photo by Jim Spellman/WireImage)
NEW YORK, NY - JUNE 14: Actors Kelly Preston and John Travolta attend the 'Gotti' New York premiere at SVA Theater on June 14, 2018 in New York City. (Photo by Jim Spellman/WireImage)
MIAMI, FL - JUNE 8: John Travolta and Kelly Preston are seen on the set of 'Despierta America' at Univision Studios to promote the film 'GOTTI' on June 8, 2018 in Miami, Florida. (Photo by Alexander Tamargo/Getty Images)
BROOKLYN, NY - JUNE 12: John Gotti Jr., Kelly Preston and John Travolta attend the ceremony to honor John Travolta for his body of work in TV and Film, in anticipation of the release of ?Gotti? movie on June 15th, 2018 at Lenny's Pizza on June 12, 2018 in Brooklyn, New York. (Photo by Theo Wargo/Getty Images for ?Gotti? Movie)
MIAMI BEACH, FL - JUNE 07: John Travolta And Kelly Preston Celebrate Their New Film 'Gotti' at Fontainebleau Hotel on June 7, 2018 in Miami Beach, Florida. (Photo by John Parra/Getty Images)
US actor John Travolta (L) and his wife US actress Kelly Preston pose on May 15, 2018 during a photocall for the film 'Gotti' at the 71st edition of the Cannes Film Festival in Cannes, southern France. (Photo by Anne-Christine POUJOULAT / AFP) (Photo credit should read ANNE-CHRISTINE POUJOULAT/AFP/Getty Images)
TOPSHOT - US actor John Travolta (L) and his wife US actress Kelly Preston pose on May 15, 2018 during a photocall for the film 'Gotti' at the 71st edition of the Cannes Film Festival in Cannes, southern France. (Photo by Anne-Christine POUJOULAT / AFP) (Photo credit should read ANNE-CHRISTINE POUJOULAT/AFP/Getty Images)
CANNES, FRANCE - MAY 15: John Travolta and Kelly Preston attend the screening of 'Solo: A Star Wars Story' during the 71st annual Cannes Film Festival at Palais des Festivals on May 15, 2018 in Cannes, France. (Photo by Tony Barson/FilmMagic)
US actor John Travolta (L) and his wife US actress Kelly Preston arrive on May 15, 2018 for the screening of the film 'Solo : A Star Wars Story' at the 71st edition of the Cannes Film Festival in Cannes, southern France. (Photo by VALERY HACHE / AFP) (Photo credit should read VALERY HACHE/AFP/Getty Images)
BEVERLY HILLS, CA - JANUARY 08: John Travolta, Kelly Preston arrives at the 74th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 8, 2017 in Beverly Hills, California. (Photo by Steve Granitz/WireImage)
LOS ANGELES, CA - SEPTEMBER 18: (L-R) Actors John Travolta and Kelly Preston attend the 68th Annual Primetime Emmy Awards at Microsoft Theater on September 18, 2016 in Los Angeles, California. (Photo by Dan MacMedan/WireImage)
LOS ANGELES, CA - SEPTEMBER 18: Actors John Travolta and Kelly Preston attend the 68th Annual Primetime Emmy Awards at Microsoft Theater on September 18, 2016 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)
LOS ANGELES, CALIFORNIA - APRIL 04: John Travolta and Kelly Preston attend the FX's For Your Consideration Event for 'The People v. O.J. Simpson - American Crime Story' at The Theatre at Ace Hotel on April 4, 2016 in Los Angeles, California. (Photo by JB Lacroix/WireImage)
NEW YORK, NY - MARCH 30: John Travolta and Kelly Preston attend the FX Networks Upfront Screening Of 'The People v. O.J. Simpson: American Crime Story' at AMC Empire 25 theater on March 30, 2016 in New York City. (Photo by Daniel Zuchnik/WireImage)
WESTWOOD, CA - JANUARY 27: Actors John Travolta and Kelly Preston arrive at the premiere of 'FX's 'American Crime Story - The People V. O.J. Simpson' at Westwood Village Theatre on January 27, 2016 in Westwood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
NAPA, CA - NOVEMBER 14: Actor John Travolta and wife Kelly Preston attend the world premiere of 'Life on the Line' during the 2015 Napa Valley Film Festival at the Lincoln Theater on November 14, 2015 in Yountville, California. (Photo by C Flanigan/FilmMagic)
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