That Miley Cyrus sure is one calculated genius, drawing you in with shiny sparkly controversy and then flipping the script and giving you just her voice. Now that her album is out, she's been doing a series of tamer performances that showcase her vocal chords, which actually make very nice sounds, even without autotune—a rare trait in a pop star these days.

Her latest performance aired on last night's Late Night, where Cyrus delivered an a cappella version of "We Can't Stop" with Jimmy Fallon and the Roots, who make everyone seem so lovable. Watch as Fallon reacts to getting the "big butt" lyric aimed at him, and Questlove feigning absolute shock at that cocaine line...