Donna Mills, who starred in the “Dallas” spinoff “Knots Landing,” recently took to Instagram and dressed up as Sandy from "Grease," a role made famous by Olivia Newton-John.

Here's why!" she captioned it. Mills, 81, said in the clip that she had gone to school with Jim Jacobs, who co-wrote the musical on which the iconic 1978 film was based.

Olivia Newton-John famously played Sandy in 1978's Grease Donna Mills claims to be the blueprint for Grease's Sandy. The TV icon, who is famous for her Dallas spin-off series Knots Landing, shared ...

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