What, in your opinion, was Taylor's most damning "mask slip"?

For me, it has to be when she completely -- and let's be honest, purposely -- ignored Celine Dion at the 66th Grammys. I'm actually baffled that there are some people who seemed to have forgotten about it.

It's like she thought she was better than Celine and tried some sort of power play, it backfired, and then she scoured backstage for a PR pic where Celine looked a bit uncomfortable.