"Chelsea Dagger" is a song by Scottish rock band The Fratellis. It was released as the second single from their debut studio album, Costello Music (2006), on 28 August 2006. It is named after Jon Fratelli's wife Heather, a burlesque dancer whose stage name – Chelsea Dagger, a play on Britney Spears – he borrowed for the song. Fratelli described the tune as "a rock 'n' roll gig in an old speakeasy or something like that."