"Boyfriend" is a song recorded by American singer Ashlee Simpson for her second studio album, I Am Me (2005).

It was written by Simpson, Kara DioGuardi and John Shanks, who also produced the song.

The lyrics of the song consist of Simpson insisting to another girl that "You really got it wrong: I didn't steal your boyfriend."

Simpson initially denied rumors that the song refers to an alleged relationship with Wilmer Valderrama, ex-boyfriend of Lindsay Lohan, saying "It's not about one person in particular, it's just something every girl can relate to...It's a song about [how] every girl out there sometimes thinks you stole her boyfriend.

[12] The single's music video, directed by Marc Webb, was filmed in Los Angeles, California over two days, August 31 – September 1, 2005.

Eventually she evades them and reaches a junkyard, where she and her band perform the song before a crowd of young people.

In January 2006, Simpson performed the song on Top of the Pops Reloaded in the UK.

[25] On April 12, she sang "Boyfriend" at the MTV Australia Video Music Awards (which she also hosted), before starting to sing "L.O.V.E."