"Alien" is a song by American recording artist Britney Spears for her eighth studio album Britney Jean (2013). It was written and produced by William Orbit, Ana Diaz, and Dan Traynor, with additional songwriting provided by Spears,and Anthony Prestonz. "Alien" is a mid-tempo dance-pop song, which lyrically discusses Spears' feelings of loneliness. "Alien" received acclaim from music critics, who appreciated its production and recognized it as being among the more personal offerings from the record. The track peaked at number 8 on the U.S Bubbling Under Hot 100 Singles and debuted at 147 on the French Singles Chart despite not being a single from Britney Jean. The track has been performed during Spears' ongoing residency show Britney: Piece of Me.