Olivia's death revealed to Grease audience

Olivia Newton-John and John Travolta in 1978 film Grease
Olivia Newton-John and John Travolta starred in the 1978 movie version of Grease. -AP

The star of the West End production of Grease says it was "surreal" to hear the news of Olivia Newton-John's death during the interval of the show and later reveal it to audience members.

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