"Piece of Me" is a song by American recording artist Britney Spears from her fifth studio album, Blackout. It was released on November 27, 2007 by Jive Records as the second single from the album. The song was co-written and produced by Bloodshy & Avant as a response to the media scrutiny and sensationalism of Spears's private life, which they had seen by working with her over the years. "Piece of Me" was the last song to be recorded for Blackout. The self-manifesto song's lyrics are written like a biography retelling her mishaps. Musically, "Piece of Me" is an electro song that runs through a down-tempo dance beat. Spears's voice is heavily synthesized, and constantly shifts in pitch. Backing vocals are provided by Bloodshy & Avant and Robyn.

The song has received general critical acclaim, praising its production and defiant lyrics, while citing it as one of the highlights from Blackout. Rolling Stone ranked the song at number fifteen on their list of the 100 Best Songs of 2007. It was also commercially successful, peaking at number one in Ireland and reaching top ten positions in Australia, Austria, Canada, Denmark, Finland, New Zealand, Sweden and the United Kingdom. In the United States, it became the second single from the album to have peaked at the top of the Billboard Hot Dance Club Play chart.

Britney Jean Spears (born December 2, 1981) is an American recording artist and entertainer. Born in McComb, Mississippi, and raised in Kentwood, Louisiana, Spears began performing as a child, landing acting roles in stage productions and television shows. She signed with Jive Records in 1997 and released her debut album ...Baby One More Time in 1999, which became the best-selling album by a teenage solo artist. During her first decade in the music industry, she became a prominent figure in mainstream popular music and popular culture, followed by a much-publicized personal life. Her first two albums established her as a pop icon and broke sales records, while title tracks "...Baby One More Time" and "Oops!... I Did It Again" became international number-one hits. Spears was credited with influencing the revival of teen pop during the late 1990s, and became the 'best-selling teen aged artist of all time' before she turned 20, garnering her the honorific title of "Princess of Pop".

Ashlee Nicole Simpson (born October 3, 1984) is an American singer-songwriter and actress. She rose to prominence in 2004 with the success of her number-one debut album Autobiography. Her reality series, The Ashlee Simpson Show, aired for two seasons. Following a North American concert tour and a film appearance, Simpson released her second number-one album, I Am Me (2005). Simpson assumed creative control over her third album, Bittersweet World (2008).

Simpson was born in Waco, Texas and raised in the Richardson area of Texas. She is the daughter of Tina Ann (née Drew), a homemaker, and Joe Truett Simpson, a former psychologist and Baptist youth minister who works as Simpson's agent. Simpson has an older sister, Jessica, who is also a singer and actress. She attended the same schools as her sister, Prairie Creek Elementary and Richardson North Junior High.

In 1987, when Simpson was three years old, she began studying classical ballet. Simpson enrolled at the School of American Ballet in New York City in 1995, a year in advance. During this time, Simpson suffered from an eating disorder for about six months but received treatment from her parents. Tina and Joe Simpson made the decision to relocate to Los Angeles, California for Jessica's singing career in 1999. Subsequently, Ashlee was cast in television commercials.