After Gaga stopped by Mariah's show at New York's Beacon Theatre on Sunday, where she has been performing a six-show residency at the venue celebrating the holiday season, Mother Monster snuck backstage to snap a shot with the "All I Want For Christmas" singer.
"Hey ladies, Merry F--king Christmas," Gaga said on Instagram. "Love, Mariah and Gaga This lady is so kind, such a star, and sounding legendary tonight at Beacon Theatre."
Looks like Gaga got quite the holiday show with Mariah singing some classic songs off her two Christmas albums, including a rousing rendition of "Joy To the World."
And Mariah's voice sounded on point during "Hark! The Herald Angels Sing."
Of course, Mariah, being the gracious host that she is, gave out presents to some lucky little lambs.