Olivia Newton-John was reunited with her Grease costar Didi Conn to sing Summer Nights in Las Vegas on Saturday night.

Newton-John, 66, and Conn, 63, who played cousins Sandy and Frenchy in the 1978 classic film, reunited on stage at the Flamingo Hotel & Casino as part of Newton-John’s long-term Vegas show.

Dressed in black and pink jackets much like their characters wore as the Pink Ladies in the film, the two sang the famous song, Summer Nights, transporting the audience back in time.

The Olivia Newton-John: Summer Nights show features an eight-piece band and features many of the four-time Grammy award-winning singer’s famous songs, including Hopelessly Devoted to You and You’re The One That I Want, Let Me Be There, I Honestly Love You, Please, Mr. Please and Physical.

Grease is the word! Olivia Newton-John & Didi Conn perform in Las Vegas–see the photos! http://t.co/1xTb2a1qgy pic.twitter.com/RuwiFsQAiv

— E! Online (@eonline) January 5, 2015

Conn reprised her role as Frenchy in the 1982 Grease 2, which was a bit of a bomb and featured Michelle Pfeiffer and Maxwell Caulfield.

Fab time with my favorite gals @olivianj #didiconn @FlamingoVegas for a mini #greasereunion pic.twitter.com/f02VOv9uhh

— Michael Caprio (@MikeCaprio) January 5, 2015

The British-born Australian announced on Twitter in December that Summer Nights – Live in Las Vegas will be released as a two-CD set in 2015.

Excited that "Summer Nights – Live in Las Vegas" will be released as 2-CD set. (Coming soon in 2015.) http://t.co/BXdeB2GYpn

— Olivia Newton-John (@olivianj) December 29, 2014