"Ego" is the second official single from British-Irish girl group The Saturdays' second studio album, Wordshaker, and their seventh single overall. The song is a strong electropop song. The song was written by Steve Mac and co-written by Ina Wroldsen and Rhys Barker, who has previously worked on the band's singles. The song was produced by Steve Mac. It was released onto radio station on 25 November 2009.
The single was released by Fascination and Polydor Records on 3 January 2010 as the second single from Wordshaker. .