Afterward, she followed up with a killer rendition of Hozier's "Take Me to Church." Her gravely vocals lend a powerful edge to the already anthemic song.

Talking with DJ Clara Amfo, Lovato confessed how surprised and excited she was when she first heard "Take Me to Church" on the radio. "I think I even tweeted, 'Thank God that somebody put this on radio, because this is incredible music,'" she said. "I remember the first time I heard it, definitely."