"Kelsey" is a single by the group Metro Station released in August 7, 2007 from their first album, Metro Station. It was re-released on March 17, 2009, after the success of "Shake It" and "Seventeen Forever". The song was the band's third UK single, released on December 14, 2009, as a double A-side with a cover version of "Last Christmas". The song was produced by Justin Pierre and Josh Cain from the band Motion City Soundtrack. Pierre also sings backing vocals on the song. The song was written about Pierre's friend Kelsey Siemens.