"Secret" is a song by American duo The Pierces, released in 2007, as a single from their third studio album Thirteen Tales of Love and Revenge (2007). It was written by Catherine Pierce and produced by Roger Greenawalt. A new version of the song titled "Secret 2020", released on June 23, 2020, was produced by Lindsay Marcus. The song's original version was featured on television shows Gossip Girl (2007–2012) and Pretty Little Liars (the latter of which also served as the theme song).