Ariana Grande definitely has no more tears left to cry after her latest star-studded duet.

On Tuesday (August 6), the 26-year-old pop star surprised concertgoers at Barbra Streisand's concert in Chicago, where she appeared on stage to sing Streisand and Donna Summer's 1979 disco duet "No More Tears (Enough Is Enough)" alongside the 77-year-old entertainment icon.

After their joint performance at the United Center, the two performers gushed about each other on social media.

"Secret's out. Thank you, Ariana Grande," Streisand captioned a selfie of the pair on Instagram, to which Grande replied in the comments, "I'm sobbing. Love you so much. I cant ... get over this. It’s just.... the most special and cherished experience ever. Thank you."

On Twitter, Grande continued to express her emotions about the special duet, sharing that she was "shaking and crying" and that she didn't "have the words yet" to capture just how special her experience working with Streisand was.

See Grande's reactions to the moment and see a clip of their duet, below: