Olivia Newton-John, Didi Conn

David Becker/WireImage

Oh, the gang's together!

OK, not quite. But we'll take two of them! Olivia Newton-John and Didi Conn, who played Sandy and Frenchy in the 1978 cult musical hit film Grease, reunited on Saturday on stage at the Flamingo Hotel & Casino in Las Vegas at one of the former star's residency shows.

The pair sang the movie track "Summer Nights." Conn even wore a pink jacket, similar to the one Frenchy sports in the movie as a member of the Pink Ladies clique. Newton-John wore a black leather jacket, channeling her "good girl gone bad" Grease character.

The two were also seen together backstage. Adorable!

Newton-John's show, which is called Olivia Newton-John: Summer Nights, features an eight-piece band. She usually performs several songs from Grease. Others include "Hopelessly Devoted to You" and "You're The One That I Want." She also sings her solo singles, such as her '80s hit "Physical." 

Conn definitely looked like she had a blast in Vegas! A day earlier, she hung out with two resident hotties...the Chippendales.

Olivia Newton-John, Didi Conn

David Becker/WireImage

Didi Conn

David Becker/WireImage

In Grease, one of the most popular movies in America of all time, Newton-John plays a new girl at a high school who falls in love with hot "bad boy" Danny, played by John Travolta.

Frenchy is Sandy's cousin, a beauty school dropout and a veteran member of the Pink Ladies, who are close to Danny's T-Birds group.

Olivia Newton-John, Didi Cohn, Grease

Paramount Pictures

Conn was one of the few cast members of Grease who reprised her role in a 1982 sequel, Grease 2, which starred Michelle Pfeiffer and Maxwell Caulfield.

Newton-John, 66, and Conn, 63, have reunited before. In 2012, Conn hosted a Sirius XM radio town hall event featuring Newton-John and Travolta, who is now 60.

Olivia Newton-John, Didi Conn, John Travolta

Mike Coppola/Getty Images for SiriusXM

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