Fret not, guardians of authenticity! Bubbly, super-assured pop variable Miley Cyrus does virtually all her own lip-synching when she performs live in concert. All her own costume-wearing too. Her PR firm has assured us of this. Yes, there is that YouTube video clip that shows the 15-year-old star of the Disney TV series Hannah Montana surreptitiously exiting the stage in the midst of a song, only to have a body double, dressed in identical white go-go boots and classy blonde stripper wig, take her place for a convincingly simulated half-minute of dance-inspired flailings and high-energy pretend-singing.

But does that make Cyrus a fraud — Hannah Nontana, Hannah Faketana, or Miley Vanilli, as Internet hecklers have taken to calling her? Or is she just impressively committed to wardrobe diversity?

On her TV series, Cyrus plays a character with a dual identity. Most of the time, she’s Miley Stewart, an average teen… More…