Simon Cowell's protégée trotted out her smash hit "Bleeding Love." And it apparently made her "Happy," because she was back the next season, too.
The Oscar winner didn't need to sweat through 12-hour rehearsals as a contestant to reveal a bangin' new bod.
The Eurythmics frontwoman couldn't help but break hearts with "Little Bird" and "Universal Child."
We're still waiting for him to do Project Runway, though...
The fashionista went country with "Come on Over."
Nick, Joe and Kevin burned up the DWTS stage on more than one occasion.
"All I Wanna Do" and "Out of Our Heads"
Who doesn't want this guy serenading the room with "Carry You Home" at some point? Coincidence: ex Petra Nemcova ended up being a contestant a few seasons later.
The "Complicated" singer performed her signature tune.
NEXT GALLERY: Dancing With the Stars Season 13 Cast