"Bad Liar" is a song by American singer Selena Gomez. The track was written by Gomez, Julia Michaels, Justin Tranter and producer Ian Kirkpatrick. The song samples the bassline from Talking Heads' 1977 single "Psycho Killer", written by David Byrne, Chris Frantz and Tina Weymouth. A vertical music video accompanied the release, becoming the first music video to premiere on Spotify, where it was made available exclusively. The song's official music video directed by Jesse Peretz, was released on June 14, 2017 on Gomez's Vevo channel on YouTube, in which she plays four characters.