"Part of Me" is a song by American recording artist Katy Perry. The song was written by Perry, Bonnie McKee, Lukasz Gottwald, Henry Walter, and Max Martin, while the production was done by Dr. Luke and Cirkut. The song was released as the first single from "Teenage Dream: The Complete Confection", which is a re-release of her album "Teenage Dream". This song was leaked several times; in late 2010, the entire demo of the song leaked online, with music critics comparing the song to Perry's previous single "California Gurls" (2010). The lyrics were changed on the released version, prompting speculation that the lyrics were directed towards ex-husband Russell Brand, which Perry later denied. Following a performance on the 54th Grammy Awards, the song debuted at number one on the "Billboard" Hot 100.