Happy 20th Birthday, Miley Cyrus! See Her Fashion Evolution: Young Sweetheart to Sexy Siren (PHOTOS)

In one of her first-ever red carpet appearances back in May 2006, a then only 13-year-old Miley stepped out for the Academy of Country Music Awards in Las Vegas. Wearing minimal makeup and a cute purple dress, Miley looked more like a little girl all dressed up in her Sunday best than a Hollywood starlet in the making.