John TravoltaandOlivia Newton-Johnenjoyed an enduring friendship over the years since makingGreasetogether.

The costars sang and danced opposite each other as Danny and Sandy in the classic 1978 movie musical. In the decades since they have supported each other through tragedy and major life milestones. They evenreunited and dressed up as the iconic lovebirdsduring the Meet n’Greasesing-along event at the Coral Sky Amphitheater in West Palm Beach, Florida, back in December 2019.

“We did something life-changing, making that film,” Newton-John told PEOPLEback in 2018 on the film’s 40th anniversary. “[At the premiere] you got the feeling from the energy that something was happening. It was a huge response. I feel grateful to be a part of that and to have worked with him. We’ve stayed friends ever since.”

“[In tough times] John always reaches out to me,” she added, as Travolta said, “When you share that kind of meteoric success — and nothing has been able to exceed it — you share a bond. I’ve been through her having a child, getting divorced, losing her sister. She’s been through my getting married, having children. It’s wonderful and full of shared memories.”

Newton-John and Travolta, 1978.Dennis Stone/Mirrorpix/Getty

John Travolta and his co star Olivia Newton

Travolta, who also co-starred with Newton-John in the 1983 filmTwo of a Kind, also said, “Olivia’s quite a ­spectacular human being. She’s worthy of good friendship.”

On Monday, Newton-John’s husband John Easterlingannouncedvia her Instagram pagethat the singer/actress diedpeacefully at her Ranch in Southern California earlier in the morning. She was 73.

John Travolta and Olivia Newton-John at the 2018 G’Day USA Black Tie Gala on Jan. 27, 2018.John Sciulli/Getty

John Travolta and Olivia Newton

Travolta, 68,wroteon Instagram, “My dearest Olivia, you made all of our lives so much better. Your impact was incredible. I love you so much. We will see you down theroad and we will all be together again. Yours from the moment I saw you and forever! Your Danny, your John!”

In 2018.Alberto E. Rodriguez/Getty

Olivia Newton-John (L) and John Travolta

Years after Newton-John announced in May 2017 thatshe was diagnosed with breast cancerthat had metastasized to the sacrum, Travoltashowed support when askedabout her at a red carpet event in 2019. “She looks incredible,“he toldEntertainment Tonightat the time. “She doesn’t look any different than [she did] years ago, and I’m very proud of her.”

Earlier this year, when Travolta shared a photo with sonBen, 11, and daughterElla, 22, on New Year’s Eve, Newton-John complimented them in the comment section. “Ella you look stunning and classy! The dress is gorgeous. Wishing you and Ben and Dad a Healthy happy New Year ❤️.”

In 1992.Ron Galella Collection/Getty

Olivia Newton-John and actor John Travolta

Preston’s death “really strengthened my resolve” to form theOlivia Newton-John Foundation, she added, “because I’ve lost way too many friends to cancer, family members and friends. Having lived with it, this is my dream. This is my passion to see a world beyond cancer.”

source: people.com