Video of the performance was captured by a fan in the inexplicably relaxed, calm audience (Seriously, were they handing out Ambien? Sure, it's not a heavy metal concert, but some of these people were full-on asleep).
The American Idol alum also disclosed that her upcoming project "might have a special guest…" Could that special guest be Sam Smith? There is literally no way to tell, but her cover was really good so everybody should cross their fingers and wish really, really hard.
However, sometimes a cover is just a cover. Before singing "Stay With Me," Clarkson also sang "Don't You Wanna Stay" which she originally recorded with country artist Jason Aldean.