(CNN) — Barbra Streisand brought out Ariana Grande for a surprise appearance Tuesday during her concert in Chicago, and fans of both went nuts.

The two performed “No More Tears (Enough Is Enough)” together and the duet left Grande in tears because she got to perform with her idol.

READ MORE: Another Victim Of Serial Killer John Wayne Gacy Identified: Francis Wayne Alexander, Of North Carolina

Fans quickly began posting clips of the duet at the United Center on social media.

Streisand even posted a backstage photo of the two together getting ready for the show, thanking Grande for joining her and adding, “Secret’s out.”

READ MORE: Dozens Of CPD Officers, Other City Workers Rally Against Vaccine Mandate As Alderman Introduces Proposal To Repeal It

Grande, meanwhile, said she will be “cherishing this moment forever” and revealed she was sobbing after the performance. “Shaking and crying,” she wrote.

Streisand originally performed the song with the late Donna Summer.

MORE NEWS: COVID Booster Shots Now Available In Chicago

© 2019 Cable News Network, Inc., a Time Warner Company. All rights reserved.