Olivia Newton-John and John Travolta dress up as Danny and Sandy for first time since Grease

More than 40 years after this iconic movie hit the silver screen, Olivia Newton-John and John Travolta have reprised their roles as Sandy and Danny.

Olivia Newton-John and John Travolta are back as Danny and Sandy four decades after the movie Grease shot them to superstardom.

Newton-John, 71, and Travolta, 65, dressed up as the ‘50s-styled lovebirds during the Meet n’ Grease sing-along event at the Coral Sky Amphitheater in Florida.

In a backstage photo shared by Newton-John on social media, the Australian legend is wearing a yellow cardigan and matching skirt just like the outfit Sandy wore in the 1978 film, while Travolta rocks an all-black ensemble complete with a leather jacket.

Back in the day … Olivia Newton-John and John Travolta in a promo shot for Grease in 1978. Picture: Paramount Pictures/Fotos International/Getty

“First time in costume since we made the movie,” Newton-John captioned the candid snapshot. “So excited!!”

But that’s not all.

As the party got into full swing, Newton-John transformed from good girl into her cooler self from the movie when she changed into a leather jacket and black leggings like the one she wore during the Grease finale.

Olivia Newton John and John Travolta in Grease. Picture; Supplied

ONJ auctioned off the famous leather jacket she wore in Grease for $US243,000 ($A355,000) to raise funds for the Olivia Newton-John Cancer Wellness and Research Centre.

Grease memorabilia was recently returned to ONJ to put on permanent display at the research institute in Melbourne.

An entrepreneur who bought the jacket said in a video: “The odds of beating a recurring cancer using the newest emerging therapies is a thousand-fold greater than someone appearing out of the blue, buying your most famous and cherished icon, and returning it to you, which is what I’m going to do right now.

Olivia Newton-John in that famous jacket from Grease. Picture: Nicole Cleary

“This jacket belongs to you and the collective soul of those who love you. Those for whom you are the soundtrack of their lives. It should not sit in a billionaire’s closet for country club bragging rights.

“For this reason, I humbly and respectfully return it to its rightful owner, which is you,” the man, who wished to remain anonymous, said. “Godspeed for a quick recovery.”

Newton-John founded the ONJ Cancer Centre during her first battle in 1992. She overcame cancer again in 2013, but in May 2017, she was told cancer had metastasised and spread to her bones.

Olivia Newton-John and John Travolta attend the Grease 40th anniversary screening in LA in August 2018. Picture; Getty/AFP

Travolta recently said of ONJ: “When you share that kind of meteoric success—and nothing has been able to exceed it—you share a bond,” Travolta said in the 2018 issue. “I’ve been through her having a child, getting divorced, losing her sister. She’s been through my getting married, having children. It’s wonderful and full of shared memories.”

“We did something life-changing, making that film,” Newton-John told People!.

A different time. Travolta and Newton-John. Picture: Getty

“(At the premiere) you got the feeling from the energy that something was happening. It was a huge response. I feel grateful to be a part of that and to have worked with him. We’ve stayed friends ever since.”

Still the one everyone wants … Olivia Newton-John. Picture: AFP

Picture: Supplied