You can watch the full performance below - Katie arrives near the end and frankly does an impressive job of rescuing what is otherwise several minutes of absolute car-crash television.
As usual it seems set out to humiliate the performers, rather than to bring them back as heroes of series gone by, and Katie once again brings an undeserved amount of grace and elegance to the X Factor stage which pretty much sums up how she's always been treated by the show.
But none of that matters - what matters is her tweet just before 11pm on December 13th (just a few minutes ago, as I write this) which has really set the Katie-cat among the pigeons for her Twitter followers.
Katie's tweet said:
And just in case she deletes it or it won't load for any reason, that is "Bye bye London!! See y'all on the other side.... #seeyounextyear #confirmed #chair".
Does this mean we can expect to see Katie Waissel judge X Factor 2015? Is the 'chair' she refers to one of the coveted X Factor mentors' chairs?
This IS Katie after all, so nothing is impossible... watch this space for official confirmation, if that really is what La Waissel was hinting at.
Either way it was a cathartic return to the show for Katie, who also posted on her Instagram account, where a picture paints a thousand words (or 65 words, in Katie's case...) and allowed her to send a message too long to tweet.
Again, will this 'new chapter' see Katie Waissel mentor for X Factor 2015? Or are the ever-hopeful Waissel Warriors jumping to conclusions?
It's too early to be certain, but you can bet her fans will have their fingers crossed - Katie has written X Factor columns for magazines and websites over the past couple of years, so her association with the show has never faded (and frankly, never will).
With strong opinions and no fear of expressing them, personally I think Katie would be a fantastic X Factor mentor for 2015; she might even be enough to convince me to watch it again.
If she is confirmed for one of the mentors' chairs in 2015, I'll just be hoping the media are a little kinder in their coverage of her than they were when she was a contestant on the show.
UPDATE: What if she meant The Voice?
Just a quick addition to this - what if when Katie said 'see you on the other side', she meant it more literally than anyone has realised?
People don't tend to talk about The X Factor judges/mentors in terms of the chairs they sit in, but there is of course a similar show where the mentors' chairs are a much more significant part of the production - The Voice.
It's on 'the other side' in the sense that it's on the BBC rather than ITV, and the mentors change much more regularly than they do on The X Factor.
What if... maybe, just maybe... Katie's 'confirmed chair' for next year is over at the Beeb? Personally I think she'd be a great fit for the show.