It was enough to bring any true diva lover to tears.

Ariana Grande made a surprise appearance Tuesday at Barbra Streisand’s one-night-only concert at Chicago’s United Center. The powerhouse pop pair sang “No More Tears (Enough Is Enough),” Streisand’s 1979 disco duet with the late Donna Summer.

“My love life is boring me to tears,” the legendary singer, 77, crooned as Grande, 26, appeared from the back of the stage — eliciting a massive roar of applause from the crowd.

Following the song, the two hugged and Grande said, “I’m gonna go pass out” before pointing at the ground and adding, “You’re just gonna find 10 pounds of hair.”

Streisand teased the duet to come on Monday, posting a photo of her and Grande’s just-manicured fingernails. “Made a new friend,” Streisand captioned the Instagram picture.

Following the performance, Streisand posted another photo with Grande across her social media platforms — this time of the two standing together. “Secret’s out,” Streisand commented.

“Cherishing this moment forever,” Grande captioned the same image in black and white, writing on Twitter, “Hello shaking and crying @Barbra Streisand. Don’t have words yet goodbye.”

The entire performance can currently be viewed — while they last — on Grande’s Instagram Stories.

The duet comes days after Grande released her new single and accompanying music video for “Boyfriend.”