John Travolta took to social media to pay tribute to Olivia Newton-John, his “Grease” co-star who died Monday at 73 years old.

John Travolta took to social media to pay tribute to Olivia Newton-John, his “Grease” co-star who died Monday at 73 years old.

 Olivia Newton-John 

John Travolta, Hugh Jackman, And More React Following The Death Of Olivia Newton-John

"My dearest Olivia, you made all of our lives so much better," the actor wrote on Instagram. "Your impact was incredible. I love you so much."