Teenage singer/actress Miley Cyrus has confessed to using a body double during concert performances so she has time to make costume changes. The star was caught out by eagle-eyed fans who spotted a lookalike onstage during a recent show on the sold-out Miley Cyrus/Hannah Montana Best Of Both Worlds tour. But the 15-year-old's representative insists a double is a necessity of the performance, telling OK! magazine, "To help speed the transition from Hannah to Miley, there is a production element during the performance of We Got The Party incorporating a body double for Miley. "After Hannah has completed the featured verse on the duet with the Jonas Brothers, a body double appears approximately one to two minutes prior to the end of the song in order to allow Miley to remove the Hannah wig and costume and transform into Miley for her solo set. "Other than during this very brief transitional moment in the show, Miley performs live during the entirety of both the Hannah and Miley segments of the concert."