"Part of Me" is a song by American singer Katy Perry, released as the lead single from Teenage Dream: The Complete Confection.

A demo of the song leaked online in late 2010, amid speculation that the lyrics were directed to the singer's ex-boyfriend Travie McCoy.

"Part of Me" was re-worked and officially released on February 13, 2012, through Capitol Records with artwork by art director Gavin Taylor and photography by Mary Ellen Matthews.

A dance-pop and power pop song with a distinctive house beat, it has been compared to Perry's 2010 singles "Firework" and "California Gurls".

It garnered generally positive reviews for Perry's "Girl power" message but drew criticism from feminist author Naomi Wolf, who denounced it as military propaganda.

[5] The song was rumored to be a leftover cut from her Teenage Dream recording sessions, and fans speculated that the track might be included in an as-yet-unconfirmed re-release of the LP.

It was an incredible honor to tie the King of Pop's Billboard Hot 100 record, but I'm moving forward and had a few things left to get off my chest.

[10] The song was released in England, Scotland, Wales, France, and Ireland on March 18, 2012 under the digital download and CD single formats.

[5] The song begins with Perry's somber and emotional delivery of the line, "Days like this I want to drive away/ Pack my bags and watch your shadow fade."

[22] The beat reaches a peak at the chorus, and Perry's tone and the song's lyrics become more aggressive and prominent as she sings, "This is the Part of me that you're never gonna ever take away from me."

[5][22] James Dinh of MTV noted that "the pop star appears strong, bold and just a tad resentful after a breakup" on the track.

[5] His analysis of the lyrics observed that "The singer declares herself unbreakable after a breakup, evident in lines such as "Days like this I want to drive away/ Pack my bags and watch your shadow fade/ 'Cause you chewed me up and spit me out/ Like I was poison in your mouth/ You took my light, you drained me down/ But that was then and this is now, now look at me.

"[5] Dinh pointed out similarities between "Part of Me" and Perry's previous single "California Gurls", noting that "the tune's steady beat amplifies" as the chorus starts.

[23] Edna Gundersen from USA Today stated: "Katy Perry could be addressing her ex or her detractors on this defiant slapdown, a gleaming "Firework"-like pop torpedo propelled by slick beats and a brazen chorus.

"[24] Chris Ryan, also of MTV, inferred that the song was aimed at Perry's ex-boyfriend Travie McCoy,[15] while New York magazine journalist Amanda Dobbis described it as "another break-up anthem".

[25] Fans and media noted differences in the lyrics between the demo and the single, and claimed that the changes redirected the song's subject from McCoy to Perry's ex-husband Russell Brand, from whom she had recently divorced.

“The sentiment, as ever, is punch you in face crystal clear and probably meant something to one of the (probably) 17 writers who wrote the song.”[29] In the United States, "Part of Me" debuted at number one on the Billboard Hot 100 and the U.S.

[40] In the United Kingdom, "Part of Me" debuted at number 1 on the UK Singles Chart on March 25, 2012 – for the week ending date March 31, 2012 – selling 79,079 copies in its first week, beating "She Doesn't Mind" by Sean Paul to the summit of the chart to become Perry's third number-one song in Britain, following "I Kissed a Girl" in August 2008 and "California Gurls" in June 2010.

[45] Perry announced the video shortly after the song's release, tweeting, "Holy power of the Grammy's, Part Of Me is already top 10 on itunes!

[47] As filming began, pictures from the video set surfaced online, showing Perry with short hair and dressed in military clothing.

The increasingly emotional Perry gathers her possessions from her car trunk, enters a nearby restroom, and begins her change of identity.

She then burns a love note from him (as opposed to a Dear John letter) and vents her frustration through the Marine Corps Martial Arts Program.

Perry ultimately transforms into a trained warrior, clad in camouflage marine pattern, body armor and face paint.

"[52] Feminist author Naomi Wolf criticized the video as propaganda for the Marine Corps, stating "I really want to find out if she was paid by them for making it ..... it is truly shameful.

"[54] Perry told MTV that she chose the military plot because it represented the song, saying, "It's an affirmation of strength, so I wanted to go the strongest route I ever could.

[62] Perry included the song in the set list of her June 9, 2012 performance at Capital FM's Summertime Ball festival.

[63] During the performance, Perry emerged from a large box of popcorn, wearing a shirt that resembled a film reel with the stage decorated with life-sized lollipops and neon lights.

[64] This was Perry's final performance prior to her taking a musical hiatus after two years of continuous promotion for Teenage Dream.

The expansion pack includes Katy Perry-themed items, inspired by the concept and artwork of her album Teenage Dream (2010), that players can use on their own Sims.

This deal was a part of Pepsi's first global campaign, titled "Live For Now", which partners with entertainment artists and properties to promote their work.