Watch rapper Iggy Azalea perform "Teenage Dirtbag" in an unprecedented attempt at lip-syncing!
Actually, I don't think that Iggy lip-syncs all that much, or no more than any pop star probably has to for technical reasons now and then. A lot of her lyrics are so fast, and basically just talking (as opposed to hitting those high notes). It seems like as much work to mouth the words convincingly as to say them.
On the other hand, her boyfriend and competitor Nick Young seems completely incompetent as a lip-syncer! It's like he heard he was gonna be on the show in the limo they took to the studio. Get it together, dude. Your girlfriend is slaying you.