This post by Cara is right on.
I don't care what size she is, calling her "fat" is not an acceptable critique of her performance. The performance may have sucked (I haven't watched it), but calling her out because she's not a size zero anymore isn't criticism, it's insulting.
And, as Cara points out, it's got pretty far reaching implications.
If Britney Spears is "fat" now, what does that say about any woman who is bigger or less "fit" than she is? I know, I know- she's a celeb, so it's different, right? It's okay to slam her for putting on weight.
A few of the commentors on some of the sites I visit have pointed out that she's had kids, and is getting older, etc. as reasons why she's put on some weight, and that those are reasons why it's not okay to fat shame her, but you know... I don't give a damn what she's doing. I don't care if she's had ten kids, or none. I'm totally with FemStar on this one...
It doesn't matter.
It doesn't matter, because her size doesn't have a damn thing to do with whether her performance was great or not. I've for damn sure seen artists that were easily twice her size performing, and doing a damned good job entertaining me.
Have I mentioned? I'm really tired people using "you're fat" as a weapon.