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Olivia Newton-John and John Travolta's chemistry in hit movie Grease was electrifying, but did the two really date in real life? Here the stars open up about what really happened when the cameras stopped rolling...
Set against a soundtrack of original Bee Gees hits, the story of two high school students falling in love despite all odds has become one of the most successful movies of all time, clocking up an incredible $396 million worldwide.
The film's two main stars have not only gone on to have wildly successful careers, but have also maintained a friendship spanning over four decades.
So just what is their secret and did the two really fall in love off camera? Read on from everything you need to know about the pair's relationship...
Despite numerous rumours to the contrary – and some steamy pictures of the pair kissing at a party in 1978 (below) – there has been no romance between the two stars.
Olivia was 28-years-old and John was 23-years-old when they filmed Grease and the pair were on the edge of superstardom while shooting the movie.
"We were both with other people when we were filming and I think, respectfully, it just didn’t happen," she explained.
"I think it was good, because I think it kept the tension there and the chemistry. It might have been a real disaster had we decided to date or we had a falling out or something.
"So I think it was just as well that it didn’t happen. But we’re still great friends."
John Travolta himself has since spoken about the real-life chemistry he had with Olivia Newton-John.
In 2019, when the pair were filming a Q&A session, his answer was a firm "yes!" when asked if there was sexual tension on set.
“I think you saw that in ‘You’re the One That I Want,'” Travolta said, referring to the highly charged duet Sandy and Danny performed at the end of Grease: “There’s almost resolve [of] that tension right there.”
But another cast member from the movie revealed that just because they didn't date, it didn't stop John Travolta having a huge crush on Olivia Newton-John.
Didi Conn, better known as the character Frenchy in Grease, revealed the Saturday Night Fever star had the hots for his co-star.
“Oh yeah, [he did like her]," she told the Daily Mail in 2018.
"What was so much fun was that most of us were older than the characters we were playing so we just stayed in character all day long. So there was an ongoing improvisation happening so the flirting… was fine."
The actress also made an incredible revelation; that one of John and Olivia's on-screen kisses was 100% real.
She explained: "Randal Kleiser, the director, thought: 'Maybe I should make an alternative ending', and they fly up into the sky and instead of looking back, Danny looks at Sandy and pulls her closer to him and gives her the juiciest kiss and Olivia."
"You see for a moment she's surprised and then she responds. It's juicy and it's great" – see video below
"They weren't acting in that moment, it was like he had his chance and he was going to take it. It was real, it really was."
The Grease co-stars are still very close and even famously reunited in LA in 2002 to sing their classic hit ‘You’re The One That I Want’.
John Travolta has also been a huge support to Olivia Newton-John as she has undergone treatment for breast cancer.
Speaking in 2018, Olivia said: “He’s been wonderful. He calls and checks up on me."
“He came to one of my shows — right before this happened, actually, right before my diagnosis.
"I saw him and I was hobbling around the dinner table because I was having trouble sitting down. And he was concerned," adding that he “called her up with some ideas of people to see.”
John Travolta speaks very highly of Olivia: “She’s always been an incredible human being and an inspiration to millions,” he said after her cancer diagnosis.
“I know her so well. If we all put our intentions for her to get through this, she will feel it and it will support her. We love her and she loves us.”