The Chicks paid tribute to Olivia Newton-John with live performance of 'Hopelessly Devoted To You'
Olivia Newton-John has died at 73
Olivia Newton-John uses medical marijuana to manage breast cancer symptoms
A 'Grease' sing-along is coming to TV
John Travolta and Olivia Newton-John dressed up as Sandy and Danny from 'Grease'
Olivia Newton-John Is Battling Cancer for the Third Time
John Travolta busts out his old 'Grease' dance moves
'Grease' is coming back to theaters for 2 days