Why She's Sexy: Katie Armiger looks like the type of girl your mother warns you to stay away from. Sure, in reality she's as sweet as vanilla bean ice cream, but her flaming hair and soul-piercing, sky blue eyes speak danger. The new video for the song 'Playin' With Fire' doesn't help -- or hurt, depending on one's perspective. Now 21 years old, this one-time teen sensation has matured into a whiplash-inducing beauty on the red carpet.