Olivia Newton-John, 71, is battling breast cancer for the third time.
But the singer and actress was in high spirits on Friday when she reunited with Grease co-star John Travolta, 65, for an event celebrating the hit musical in Florida.
Sporting their iconic Grease costumes for the first time since the film’s release 41 years ago, Olivia took to the microphone for a special moment on stage with John.
The British-born, Australian-raised performer chose to sing a segment of the movie’s ballad Hopelessly Devoted To You.
At first appearing hesitant as she held the microphone to her mouth, she told the crowd: ‘I have to preface this with I haven’t sung in a year, so will you help me?’
Fans could be heard saying ‘aww’, before cheering and saying ‘yes’ to encourage the brave superstar.
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Olivia revealed earlier this year that she was battling breast cancer for a third time, following diagnosis’ in 1992 and 2013.
The pair, who play Danny Zuko and Sandy Olsson in the film, looked just like they did over 40 years ago at the meet n’ Grease movie sing-a-long event.
Olivia first appeared in a pleated yellow skirt and cardigan with a white shirt underneath, mirroring one of her standout looks from the film.
While on stage, she showcased her costume change into a ‘sexy’ Sandy look.
Clad in a leather jacket, the actress donned a pair of form-fitting leather leggings and a complementing silk camisole.
It comes after an anonymous buyer recently returned Olivia’s classic leather jacket from the film.
According to Reuters upon returning jacket the buyer decided to instead donate the $243,000 winning bid to the star’s cancer treatment centre.
The buyer of the jacket described himself as Olivia’s ‘No. 1 fan’ and wished her ‘God speed for a quick recovery.’
Olivia said she plans to put the jacket on display at her Melbourne cancer centre.
‘That is the most incredibly generous thing to do for me,’ she told the anonymous bidder. ‘I am so grateful, and I am just blown away.’