 Stefani opened the show with the song " Harajuku Girls " , an ode to Harajuku , the fashion district of Tokyo , Japan . She appeared on stage wearing a tiara and baby doll outfit , sitting in the red velvet and gold throne from the cover of Love . Angel . Music . Baby. and surrounded by her backing dancers , also called the Harajuku Girls , while video images of Harajuku itself played on screens behind her . Her second song was the first single from the album , " What You Waiting For ? " , which she began as a ballad before bringing it up to its usual pace . Stefani and the Harajuku Girls then left the stage to change into one @-@ piece bathing suits while her band continued to play , before returning to perform " The Real Thing " . A group of four <unk> came on stage to perform while Stefani left the stage again to change into a black @-@ and @-@ white leather <unk> . For the next song , the album 's sixth single " Crash " , the audience were then divided into male and female halves and , as images of a car hood bouncing to the beat were broadcast , each half took turns to sing the lyric " back it up , back it up " . Stefani then performed the fourth single from the album , " <unk> " . 
