This Patriotic Poolside Babe Has a Super-Famous Little Sister! Who Is She? 2 of 2 Previous Autoplay Next Share Tweet July 4, 2013 at 10:23AM EDT by Sarah Anne Lloyd Related: News, Guess Who? full size Credit: Frederick M. Brown/Getty Images It's Brandi Cyrus! If you don’t remember Miley Cyrus’s big sister Brandi from her behind-the-scenes spots on Hannah Montana, you might recognize her as a model for Rad + Refined, or as a singer/guitarist in the band Frank + Derol. Did you guess who it was?