Singer Miranda Lambert performs onstage during the 2012 iHeartRadio... News PhotoAdult,Adults Only,Ankle Boot,Arts Culture and Entertainment,Belt,Bestof,Black Belt - Fashion Item,Black Boot,Black Color,Blond Hair,Boot,Celebrities,Dress,Flexing Muscles,Form Fitted,Form Fitted Dress,Fringe,Full Length,Hair Part,High Heels,Las Vegas,Long Hair,Long Sleeved,MGM Grand Garden Arena,Microphone,Mini Dress,Miranda Lambert,Music,Music Festival,Nevada,One Person,One Woman Only,Pattern,People,Performance,Sheath Dress,Sheer Fabric,Silver Colored,Silver Dress,Singer,Sleeved Dress,Studded,Topics,Topix,USA,V-Neck,Vertical,Wavy Hair,Wide Belt,iHeartRadio,iHeartRadio Music FestivalPhotographer Collection: Getty Images Entertainment 2012 Getty ImagesLAS VEGAS, NV - SEPTEMBER 21: Singer Miranda Lambert performs onstage during the 2012 iHeartRadio Music Festival at the MGM Grand Garden Arena on September 21, 2012 in Las Vegas, Nevada. (Photo by Christopher Polk/Getty Images for Clear Channel)