"That's When" is a song recorded by American singer-songwriter Taylor Swift featuring New Zealand-born Australian country singer Keith Urban. The song is the 24th track on Swift's first re-recorded album, Fearless (Taylor's Version) (2021), a re-recording of her 2008 album Fearless. It is one of six "from the Vault" tracks that were written for the original album but were scrapped. Swift wrote the song with the Warren Brothers in 2006 and produced it with Jack Antonoff in 2021.