We don't know how or when just yet, but Olivia Newton-John has revealed that she will be collaborating with GREASE co-star John Travolta to celebrate the 40th anniversary of the musical film.
Shot in 1978, Newton-John and Travolta brought Danny and Sandy to life.
So, what will they do?
The actress/singer told The Mirror, "We are thinking up ways."
“Time goes so fast. It’s so exciting,” she added.