The two icons then sang the famous hit together and coming together at the end to hold their hands high in the air, were met with screams of delight from the Australian audience.

Relive Mariah Carey and Olivia Newton-John’s rarely heard duet of ‘Hopelessly Devoted To You’

Olivia and Barry performed 'How Can You Mend A Broken Heart' in Australia at Sound Relief in 2009

When Barry Gibb and Olivia Newton-John sang 'How Can You Mend A Broken Heart' and it was spectacular

Barry Gibb

The pair were celebrating the release of Grease on DVD in 2002 when the spectacular moment took place 24 years after they fell in love on screen as Sandy and Danny Zuko.

When Olivia Newton-John and John Travolta reunited after 24 years to sing ‘You’re The One That I Want’

The love story between Olivia Newton-John and John Travolta in 1978's box office hit movie Grease has kept audiences enraptured for over 40 years.

Did Olivia Newton-John and John Travolta ever date? When 'Grease' stars revealed what really happened on set

John Travolta and Olivia Newton-John were great friends

Olivia Newton-John: John Travolta leads tributes with emotional post about his Grease co-star

Olivia Newton-John has died

Olivia Newton-John has died, aged 73

The energy between Olivia Newton-John and Andy Gibb is palpable and lead to them recording a single for Andy's new album just a few months later.

When Andy Gibb and Olivia Newton-John sang a sizzling duet of Bee Gees hit ‘Rest Your Love On Me’

Michael Ball, Celine Dion and Olivia Newton-John all did Eurovision in the past

14 singers you totally forgot did Eurovision (or failed to get there)

Eurovision

Movie love songs

The 20 greatest movie love songs of all time, ranked in order of pure romance

Song Lists

Can you guess which is the best-selling movie soundtrack of all time?

What are the top 5 best-selling movie soundtracks of all time?

TV & Film

Olivia Newton-John in 2013

Olivia Newton-John says she is feeling "very good" in ongoing cancer recovery

One eagle-eyed fan has spotted a very – shall we say 'ballsy' – wardrobe malfunction in one scene from Grease 2 that has seemingly slipped anyone's notice for almost 40 years (pictured right).

Shocking X-rated wardrobe malfunction in Grease 2 movie spotted 39 years after its release

TV & Film

Clockwise from Left to Right: George Michael and Andrew Ridgeley, Michael Jackson and Lionel Richie and Stevie Wonder and Whitney Houston

These 17 candid photos of '80s pop stars having fun together will take you right back in time

Features

Olivia Newton-John has opened up about living with cancer in a recent interview

Olivia Newton-John shares positive update on third cancer treatment: 'I feel wonderful'

Olivia Newton-John reveals she won't be getting coronavirus vaccine

Olivia Newton-John reveals she won't be getting the coronavirus vaccine

As the Bee Gees begin to play the classic track 'Grease', the lighting crew shone a spotlight on Olivia Newton-John in the audience.

When Barry Gibb led the Bee Gees in singing ‘Grease’ to a moved Olivia Newton-John in the crowd

Bee Gees

Olivia Newton-John and her daughter Chloe's new song

Olivia Newton-John releases gorgeous new duet with daughter Chloe Lattanzi

Olivia Newton-John has dismissed sexist claims about Grease

Olivia Newton-John dismisses claims Grease is sexist: 'It's just a girl in love with a guy'