These girls definitely know how to have fun!

While performing at the Barclays Center in New York City, Cyndi Lauper — sporting fiery red hair — invited friends Liza Minnelli and Rosie O'Donnell onstage to assist her with backup vocals!

liza minnelli

The music icon is currently performing as Cher's supporting act on her Dressed to Kill tour, but instead enlisted the help of her famous pals in the audience to sing the 1983 classic, "Girls Just Want to Have Fun."

Though Cyndi had to wade into the crowd to convince Liza to come onstage, the Cabaret star eventually joined Rosie at the mic for the energetic song, where she danced while the talk show host played the tambourine.

liza minnelli

"It's a good thing I remembered the words. Well, at least some of them," Liza later admitted.

Watch a clip from the trio's performance below!