Ariana Grande Performs With Barbra Streisand

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Ariana Grande had the "best night" of her life with Barbra Streisand in Chicago.

Ari performed alongside the 77-year-old music icon on Tuesday night at Barbra's United Center concert in Chicago. Sources told People the audience "went wild" and gave a standing ovation after Grande and Streisand performed "No More Tears (Enough is Enough)," a 1979 duet Streisand originally recorded with Donna Summer. "The entire theater turned into a dance party immediately," a source said. "The whole place got up."

Streisand had teased a collaboration with Grande Monday by posting a photo of just their hands. "Made a new friend," she wrote.

"The best night of my life," Ariana wrote on her Instagram Story later that night. "I'm gonna go pass out. You're just gonna find 10 pounds of hair," she joked.

"cherishing this moment forever @barbrastreisand," she wrote on Instagram. "hello shaking and crying. thank u @BarbraStreisand. don't have words yet goodbye," she wrote.

Grande followed up by posting a photo of herself with Streisand.

Streisand shared a color version of the photo with Grande on her own account.

"Secret's out. Thank you @ArianaGrande," she wrote, adding three heart emojis.

Grande had her own concert Sunday in Chicago and will kick off the European leg of her Sweetener world tour August 17th in London. She released the new single "Boyfriend" last week.

Streisand will next perform her Simply Streisand show August 23rd in Milton, Delaware. She last released the album Walls in November, which includes the single "Don't Lie to Me."