— Additional reporting by Angela Law

Ariana Grande [1] joined Barbra Streisand [2] on stage during her concern in Chicago on Tuesday night and everyone cried, not only in person but also on Twitter.

Grande stepped out to join Streisand for "No More Tears (Enough Is Enough)", a song that Streisand originally recorded with Donna Summer in 1979. The song is basically the original "Thank You, Next", with the lyrics 'I always dreamed I'd find the perfect lover, But he turned out to be like every other man I've loved' — we see you Ari.

Fans could not keep calm, sharing videos of the duet, "omg @arianagrande anD BARBARA STREISAND ARE U KIDDING MEEEE??????" one person enthused, another posted a photo of a young Grande watching Streisand at an award show captioned, "dreams come true💫"

We should have know there was a surprise in the works when Streisand shared a photo of herself and Grande's fresh manicures [3] captioned, "Made a new friend..." This new celebrity friendship might be the best one yet. Read on to see some of the best Twitter reactions from the performance and be quick if you want to see Grande's own Instagram stories of the performance.