What was the first released single on the self-titled album released by an American country artist whose second single was co-written by Taylor Swift and released on December 1, 2008?
Kellie Pickler (album):  The lead-off single, "Don't You Know You're Beautiful", was debuted at the 43rd Academy Of Country Music awards and peaked at 21 on Hot Country Songs. 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