There’s a couple of classic examples out there of the importance of a well-placed comma (Let’s eat Grandma vs. Let’s eat, Grandma, for one, and To my parents, Ayn Rand and God, for another). Here’s my new favorite one:
Okay, here’s the deal: There’s a difference between It’s Britney Bitch! and It’s Britney, Bitch! And I’m assuming that what she intends to do is to address Bitch with the news that It’s Britney, in which case a comma is called for.
But let’s not be hasty. Perhaps she meant that she’s Britney Bitch. Who knows?