"E.T." is a song by American recording artistKaty Perry from her third studio album Teenage Dream (2010). Written by Perry, Dr. Luke, Max Martin, and Ammo, and produced by the last three, it was released as the album's third promotional single on August 17, 2010. The song was later announced as the album's fourth single and released on February 16, 2011. The single version features vocals by American rapper Kanye West, who will also appear in its Floria Sigismondi-directed music video. An official lyric video was uploaded to her youtube page on March 13, 2011.