Outside of the U.S., the song reached the top 10 in several countries, including Australia, Denmark, Norway, and the United Kingdom.

IGN.com said of the song that it "lopes along to a feel good melancholic guitar strum while [Simpson] waxes like any lovelorn 19-year old would about the current love of their life.

"[7] Another review said that the "stringy" guitar riffs in "Pieces of Me" were "simple, yet effective", with the "catchy chorus bringing the song to life.

"[8] According to one review of the album, Simpson's singing on the track goes from "impassioned wail to innocent cooing ably.

The single was released in the United Kingdom on September 27, 2004, on two CDs; the first includes a David Garcia & High Spies remix, and the second includes remixes, a medley of snippets of songs from Autobiography ("Shadow", "Autobiography", "La La", and "Better Off"), and the "Pieces of Me" music video.

The music video for the song, directed by Stefan Smith,[36] features Simpson (wearing a white shirt emblazoned with the word "punk" and a pink dress, as well as using Fostex T20RP headphones) and her band in the studio interspersed with clips of reality TV footage.

[citation needed] Simpson appeared on MTV's Total Request Live on May 17, 2004, and the "Pieces of Me" video was premiered on the show on this date.

She performed "Pieces of Me" (after a brief interview with Charles Gibson) on Good Morning America on July 19, the day before her album was released in the U.S., and on July 27, she sang it (after an interview) on Ryan Seacrest's talk show, On Air With Ryan Seacrest.

Later in 2004, on the October 23 episode of Saturday Night Live, Simpson performed "Pieces of Me" as her first of two songs that night; when she started to perform her second song (which was supposed to be "Autobiography"), a recording of "Pieces of Me" was mistakenly played instead, indicating that Simpson was using some sort of vocal aid.

She began to do an impromptu jig (which she later named as a hoedown) when she realized she had been caught lip-syncing, and then left the stage.

"[44] The incident was also parodied in Good Charlotte's "I Just Wanna Live" music video and later on Family Guy.

She also sang the song as part of a concert broadcast live over the Internet on December 6, and during the performance she pulled a member of the audience up on stage with her.

Simpson later performed the song on Dick Clark's New Year's Rockin' Eve 2005, in which she also hosted the West Coast portion of the show.

"[48] As part of the promotion for her third album, Bittersweet World, Simpson performed "Pieces of Me", together with her newer single "Little Miss Obsessive", on The TODAY Show on April 18, 2008.