I really need to listen to pre-PRISM Katy more. I only started using last.fm in September 2013, so that kind of explains the absence of any OOTB or TD era songs.
^ It'd look good...if the image wasn't stretched she looks like she's had a bit too much Christmas pudding in that pic (which isn't necessarily a bad thing!)
Just thinking about her having a Christmas staple half as iconic as AIWFCIY.
It's clear that she likes releasing "event" songs. "Firework" for 4th of July and New Years, "Birthday" for anyone's birthday and now slaying the Christmas market.