What is the year of the event which occured first, Kellie Pickler's self title album was released, or The Best Days of Your Life was released?
Best Days of Your Life: "Best Days of Your Life" is a song written and performed by American country artist Kellie Pickler, and co-written by Taylor Swift. Best Days of Your Life:  It was released on December 1, 2008 as the second single from her self-titled second album.
i don't know