Me neither. Since the 'GH:MP' era I only believe stuff when OFFICIALLY confirmed by Jive/Britney's Management. Although not even Jive is to be completely trusted.
I'm surprised and so excited about the Grammy performance
But I really hope a great show and she needs to sing at least part of the song live because if she doesn't then the haters and all the media are gonna bash her at the next day. And then they are going to start the comparisons with other performers of the night.