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

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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

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"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."