Smiler

Etymology
The singer was born Destiny Hope Cyrus but nicknamed Smiley (later Miley) by her parents because she often smiled as a baby; hence.

Noun

 * 1)  A fan of American singer and actress.
 * 2) * 2013, Erin McAuliffe, "Lorde's 'Pure Heroine'", The Observer (University of Notre Dame and Saint Mary's College), Volume 47, Issue 26, 1 October 2013, page 8:
 * When she rose to the throne of the iTunes charts with her single “Royals”, she was met with some hateful tweets from Smilers (aka Miley Cyrus fans).
 * 1) * 2014, "People to add to your timeline in 2014", The Vidette (Illinois State University), Volume 126, Number 63, 16 January 2014, page 14:
 * Smilers can expect tweets revolving around Miley's dogs, hit new album Bangerz and selfies with her classic tongue pose.