John Travolta leads tributes to Olivia Newton-John following her death

Newton-John is best known for her starring role as Sandy in the 1978 film Grease, in which she appeared opposite Travolta, who played Danny Zuko.

John Travolta has led tributes to his Grease costar Olivia Newton-John and her ‘incredible impact’ following news of her death (AP)

John Travolta has led tributes to his Grease costar Olivia Newton-John and her “incredible impact” following news of her death.

The British-born singer died “peacefully” at her ranch in Southern California on Monday morning at the age of 73, with her husband confirming her death on social media.