The "Heartbeat Song" starlet performed the tune at a recent gig in Toronto at the request of a fan. When she begins, the song is slowed. Instead of opting for huge production, Clarkson is partnered only by a piano and, of course, those incredible pipes.
When she launches into the pre-chorus, the song gets an oddly jazzy, full-band makeover. It's an interesting, delicate rendition on one of the year's biggest pop songs, one only our girl Kelly could pull off. Listen and watch above, see Tay's response to the cover below, then peep our list of nine times Clarkson kept it so real.