Grease costars John Travolta and Olivia Newton-John - who first met on the set of the 1978 hit and remained friends until the latter died in 2022 - almost had an off-screen romance, according to a friend. For his new Olivia Newton-John biography, A Little More Love, author Matthew Hild dug through old interviews and spoke to friends and colleagues who were once close to the actress to know what was actually going on behind the scenes.