Ariana Grande Performs a Surprise Duet at Barbra Streisand's Chicago Concert!

This is such a special moment between Ariana Grande and one of her idols!

The 26-year-old “thank u, next” star alongside Barbra Streisand on Tuesday evening (August 6) at Barbra‘s United Center concert in Chicago, Ill.

PHOTOS: Check out the latest pics of Ariana Grande

Ariana and Barbra performed a rendition of the classic “No More Tears (Enough Is Enough),” which Barbra originally sang with Donna Summer, and the crowd went wild!

“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 immediately after the performance.

“cherishing this moment forever @barbrastreisand,” she wrote on Instagram.

Watch footage from Ariana Grande‘s Instagram Story inside…