Hadn't thought of the song this way before but . . . .
If one only read the book (very good) .. <i>Things I Never Needed</i> would be a great fit  for <i>Confessions of a Shopaholic.</i>  
The movie ('meh' at best) played down the consequences, pretty much making light of an addiction that can ruin lives...along the lines of a perky song like <i>Something That I Want.</i> 
Just a thought . . .