The Pink Ladies had a small, brief reunion this weekend when Olivia Newton-John was joined onstage by her "Grease" co-star Didi Conn at a concert in Las Vegas.

Newton-John and Conn, who starred in the hit 1978 musical, sang and danced together again Saturday at the Flamingo Hotel & Casino, where Newton-John is holding her "Summer Nights" residency, a nod to one of the most famous songs from the flick. The pair slipped right back into character for the number, with Newton-John sporting Sandy's blonde locks and all-black leather ensemble, and Conn donning a Pink Ladies jacket like her onscreen alter ego, Frenchy.

While we would have loved if fellow Pink Ladies Rizzo (Stockard Channing), Jan (Jamie Donnelly), and Marty Maraschino (Dinah Manoff) could have joined the gals, it's nice to know that Sandy and Frenchy are still BFF.

Check out the photo above, and just try to keep the songs from "Grease" out of your heard for the rest of the afternoon.

[via: Us Weekly]

Photo credit: David Becker via Getty Images