He wrote, “Olivia was a symbol for triumphs and hopes over thirty years of her breast cancer journey.” The Olivia Newton-John Foundation Fund is dedicated to research on cancer and plant medicine.

In the wake of Newton-John’s death, Travolta, 68, penned a heartfelt tribute to his “dearest” friend and shared how she “made all of our lives so much better.” 

Your impact was amazing. I love you so much,” he wrote in an Instagram post addressed to the late star. He added, “We’ll see you again down the road. We’ll all be back together.” You are my forever and yours since the very first time I met you.

In his signature, he added, “Your Danny! Your John!”

You can find more tributes to the cast of Grease, click here.