Tonight, Lambs across America were glued to the television watching Mariah Carey's holiday concert special, which included a duet of "O Come All Ye Faithful/Hallelujah Chorus" with her mother, Patricia. And in true diva style, Carey upstaged Mom. Watch inside.

Here's video of the full performance—which is worth watching in its own right—but for the aforementioned moment, fast forward to about the 2:20 mark (a second such moment appears at about the 3:25 mark):

[Mariah Carey: Merry Christmas to You]