John Travolta Shares Sweet Birthday Tribute to Late 'Grease' Costar Olivia Newton-John

John Travolta continues to mourn the death of his Grease co-star and longtime close friend Olivia Newton-John.

This Monday, on what would have been the actress' 74th birthday, Travolta shared a sweet birthday tribute to her on his Instagram Story.

"Happy birthday my Olivia," he wrote over a throwback photo of the two wearing their iconic skintight all-black looks on the set of Grease. In the cult classic 1978 film, Travolta played lead Danny Zuko, while Newton-John played his female counterpart and love interest, Sandy Olsson.

The two remained close friends since the release of the movie, and even reunited for a Grease sing-along in 2019. Newton-John took to Instagram to share a behind-the-scenes photo of the two holding hands in their old Sandy and Danny wardrobes at the time. "First time in costume since we made the movie ! So excited!!" she wrote in the caption at the time.

Sadly, Newton-John died this August, after a decades-long battle with breast cancer. Her husband, John Easterling, confirmed the news via a message on her Facebook and Instagram pages. Upon learning of her passing, Travolta shared a touching message on his Instagram, featuring a beautiful photo of the late actress.

"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 the road and we will all be together again. Yours from the first moment I saw you and forever! Your Danny, your John!" he wrote at the time.

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