The Bee Gee star, who performed many times with Olivia Newton-John, gave a statement referring to her as his 'sister'.

'Devastated' Barry Gibb breaks silence on Olivia Newton-John's death: 'She was my sister'

Barry Gibb

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 Bee Gees were composing and recording 'Tragedy' at Critera Studios, Miami in 1978 when the rare footage was recorded.

Private studio footage of Barry Gibb and the Bee Gees recording 'Tragedy' is phenomenal

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’

Olivia Newton-John

The King of Pop and the eldest Bee Gee collaborated on the song 'All In Your Name' in 2002 and were so close MJ was asked to be the the godfather to one of Barry's children.

Barry Gibb opens up about why he asked Michael Jackson to leave his home in 2002

Barry Gibb (right) had lived in Miami since 1975 with his wife Linda and their five children, and Michael Jackson (left) felt at home in the spacious water-front property.

Barry Gibb reveals Michael Jackson secretly lived with him to escape fame: 'He slept on the floor'

Barry Gibb

The Bee Gees were in Denmark in 1993 to promote their new album Size Isn't Everything when they were invited to perform on the entertainment show, Eleva2ren.

Bee Gees sing acapella 'To Love Somebody' in spine-tingling lost footage from 1993

The TNT boys perform as the Bee Gees

When three amazing kids pretended to be the Bee Gees and it was incredible

The Bee Gees are renown for their songwriting skills and crowd-pleasing vocals and one performance in 1993 showcased their acoustic harmonies to the max.

The Bee Gees' flawless harmonies during a live MTV performance in 1993 is a lost masterpiece

Bee Gees Robin (centre), Maurice (left) and Barry Gibb (right) busked in London's Covent Garden in 1993.

Watch the extraordinary moment the Bee Gees busked on the streets of London in 1993

The clip show's Barry Gibb mishear his name and come up on stage as Michael Jackson is giving a speech at the Rock and Roll Hall of Fame

Awkward moment Barry Gibb gatecrashes Michael Jackson award speech in hilarious mixup

Barry Gibb

Bee Gees star Barry Gibb and singing sensation Barbra Streisand were presenting a Grammy Award when the Australian sex symbol gently kissed the Funny Girl star as the world watched on.

When Barry Gibb tenderly kissed Barbra Streisand live on stage at the 1981 Grammy Awards

The Gibb brothers appeared on MTV's Most Wanted during the promotion for their 1993 album Size Isn't Everything.

When Barry Gibb cheekily revealed what gets him 'in the mood' on TV

Andy Gibb gave a sensational performance of the Bee Gees' hit song 'Words' when he was just 23-years-old.

Andy Gibb outshines older brother Barry with jaw dropping solo of Bee Gees’ ‘Words’ in 1981

Ben Shephard and the Bee Gees

Bee Gees fans in uproar as Ben Shephard makes a massive Gibb gaffe on Tipping Point

1970s love songs

The 20 greatest love songs of the 1970s, ranked

Song Lists

Companion Of The Order Of Australia is the latest award Barry Gibb has received throughout his illustrious music career. (Photo: Getty)

Bee Gees legend Barry Gibb is awarded Companion Of The Order Of Australia

Barry Gibb

'Woman In Love' is Barbra Streisand's is the most globally successful song of her career.

Listen to Barry Gibb's haunting original demo of Barbra Streisand's 'Woman In Love'

Barry Gibb