So Yesterday

"So Yesterday" is a song recorded by American pop rock singer Hilary Duff. The song was written by Lauren Christy, Scott Spock, Graham Edwards, and Charlie Midnight, and produced by The Matrix for Duff's second studio album, Metamorphosis (2003). The song draws influences from pop rock music, and the lyrics chronicle the protagonist getting over a breakup with her boyfriend, declaring him as "so yesterday". The song received mixed reviews from music critics, with some of them noting its close similarity to Avril Lavigne's works, while others named it one of Duff's best songs ever.

"So Yesterday" premiered on AOL Music's "First Listen" on June 27, 2003. It was later released to United States Top 40 radios on July 15, 2003. The song was officially released on July 29, 2003 as the album's lead single. It became Duff's first single to chart in the US Billboard Hot 100, reaching number forty-two. It was moderately successful outside the US, reaching top forty in most countries it charted. The song reached number eight in Australia and was certified platinum by Australian Recording Industry Association (ARIA).

The song was accompanied by a music video, directed by Chris Applebaum, which showed Duff playing a prank on her ex-boyfriend. It was successful on various music video channels like MTV and MuchMusic. Duff performed the song on her Metamorphosis Tour and has since performed it on all her concert tours. The song is featured on her greatest hits compilations Most Wanted (2005), 4ever (2006) and Best of Hilary Duff (2008), and it also featured on the music video game Band Hero.