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"Best Days of Your Life" is the title of a song written and performed by American country artist Kellie Pickler, and co-written by Taylor Swift
. It was released on December 1, 2008 as the second single from her self-titled second album. Swift also provides background vocals on the song.
Pickler debuted the song with a performance on November 12, 2008 on the 2008 CMA Awards. Since then she has also performed the song on American Idol
, The Ellen DeGeneres Show
, and the 2009 CMT Music Awards.