"E.T." is a song by American singer Katy Perry from her third studio album, Teenage Dream (2010).
Perry co-wrote the song with its producers Dr. Luke, Max Martin, and Ammo.
"E.T." was serviced to radio stations as the album's fourth single on February 16, 2011.
Musically, it is an electronic and hip hop ballad which draws heavily from dub-step and techno, along with smaller amounts of drum and bass.
According to Perry, the song lyrically speaks of "falling in love with a foreigner".