"Do Somethin'" is a song by American singer Britney Spears from her first greatest hits album, Greatest Hits: My Prerogative (2004). It was written and produced by Christian Karlsson and Pontus Winnberg, with additional writing by Henrik Jonback and Angela Hunte. The song was never intended to be released as a single; Spears, however, wanted to shoot a music video for it, and had to convince her record company. It was then released on February 14, 2005, by Jive Records as the second single from the album outside North America. The dance-rock song features usage of electric guitars, and its lyrics allude to having a good time and not caring about other people's judgement.