'Grease' Reunion: Olivia Newton-John & Didi Conn Perform 'Summer Nights' — billboard.com

It was a high school reunion for Olivia Newton-John and Didi Conn in Las Vegas on Saturday night. The Grease girls, who played memorable best buds and cousins Sandy and Frenchy in the 1978 classic, joined one another on stage at the Flamingo Hotel & Casino during Newton-John's show. Flashback Friday: Olivia Newton-John Gets 'Physical' in 1981 Wearing black and pink jackets in tribute to their high school greaser girl and Pink Ladies roles, the two sang the famous "Summer Nights" track for the audience.

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