LAS VEGAS, NV - JANUARY 03: Entertainer Olivia Newton-John (2nd R) and actress Didi Conn (2nd L) reunite on stage to perform "Summer Nights" with back up singers Marlen Landin (L) and Steve Real at Flamingo Las Vegas on January 3, 2015 in Las Vegas, Nevada. (Photo by David Becker/WireImage)
