Britney Spears Drops F-Bomb After Heckler Calls Her A Fat B*tch (VIDEO)

Whatever you do, do not call Britney Spears a "fat b*tch." She might just drop the F-Bomb on you... live on stage! That's exactly what happened last night in Las Vegas when a rude audience member heckled Britney in between songs.

Before performing her next song "Till The World Ends," she said into a live mic: "F*cking assholes."

You tell them Brit!

And guess what? The mic is live, so she does sing live! Woohoo!

Watch the video here: