Olivia Newton-John would have turned 74 on Monday, so friends of the late singer are paying their respects.

John Travolta, who starred alongside Newton-John in the movie adaptation of Grease, saluted the late legend in a meaningful post on social media. "Happy birthday my Olivia," he wrote in an Instagram Story, sharing a still of their characters -- Danny and Sandy -- glancing adoringly at the other.

Olivia's family also honored her on her birthday. Her husband, John Easterling, shared a heartfelt tribute in the form of a beautiful memory. He recalled a trip to the Bahamas and how they were caught up in a storm that they feared would blow their boat off course.

The storm quickly subsided and left behind a beautiful rainbow while "dolphins started jumping at the bow of the boat." He closed the memory, saying, "Every day with Olivia there was a hint of magic and everyday with Olivia was a bit of the supernatural."

Olivia's daughter, Chloe Lattanzi, paid tribute to the late singer on her birthday writing, "We love you mama" along with a dolphin emoji. She shared a video of the family celebrating the late legend's birthday with a family dinner.

Newton-John died on August 8 after a years-long battle with cancer.

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