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BEVERLY HILLS, CA - AUGUST 15: Olivia Newton-John and John Travolta attend the Academy Presents "Grease" (1978) 40th Anniversary at the Samuel Goldwyn Theater on August 15, 2018 in Beverly Hills, California. (Photo by Alberto E. Rodriguez/Getty Images)

BEVERLY HILLS, CA - AUGUST 15:  Olivia Newton-John and John Travolta attend the Academy Presents "Grease" (1978) 40th Anniversary at the Samuel Goldwyn Theater on August 15, 2018 in Beverly Hills, California.  (Photo by Alberto E. Rodriguez/Getty Images)