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. 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. The song is about a narrator explaining how her former boyfriend cheated on her and moved on to a new girlfriend to start a family with, wishing them well on their new life but says that the new girl won't top what they previously once had before.