European only 3-inch 'Pocket CD' is b/w a non-album track, 'Hollaback Girl' (Hollatronix Remix). Very limited! (5000) Universal. 2005.
CD 1
01 - Hollaback Girl [Album Version]
02 - Hollaback Girl [Hollatronix Remix by Diplo]
03 - Hollaback Girl [Instrumental]
04 - Hollaback Girl [Multimedia Track]